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diff --git a/src/third_party/boost/boost/asio/strand.hpp b/src/third_party/boost/boost/asio/strand.hpp
deleted file mode 100644
index ba82e602a83..00000000000
--- a/src/third_party/boost/boost/asio/strand.hpp
+++ /dev/null
@@ -1,224 +0,0 @@
-//
-// strand.hpp
-// ~~~~~~~~~~
-//
-// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef BOOST_ASIO_STRAND_HPP
-#define BOOST_ASIO_STRAND_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include <boost/asio/detail/config.hpp>
-#include <boost/asio/detail/handler_type_requirements.hpp>
-#include <boost/asio/detail/strand_service.hpp>
-#include <boost/asio/detail/wrapped_handler.hpp>
-#include <boost/asio/io_service.hpp>
-
-#include <boost/asio/detail/push_options.hpp>
-
-namespace boost {
-namespace asio {
-
-/// Provides serialised handler execution.
-/**
- * The io_service::strand class provides the ability to post and dispatch
- * handlers with the guarantee that none of those handlers will execute
- * concurrently.
- *
- * @par Order of handler invocation
- * Given:
- *
- * @li a strand object @c s
- *
- * @li an object @c a meeting completion handler requirements
- *
- * @li an object @c a1 which is an arbitrary copy of @c a made by the
- * implementation
- *
- * @li an object @c b meeting completion handler requirements
- *
- * @li an object @c b1 which is an arbitrary copy of @c b made by the
- * implementation
- *
- * if any of the following conditions are true:
- *
- * @li @c s.post(a) happens-before @c s.post(b)
- * 
- * @li @c s.post(a) happens-before @c s.dispatch(b), where the latter is
- * performed outside the strand
- * 
- * @li @c s.dispatch(a) happens-before @c s.post(b), where the former is
- * performed outside the strand
- * 
- * @li @c s.dispatch(a) happens-before @c s.dispatch(b), where both are
- * performed outside the strand
- *   
- * then @c asio_handler_invoke(a1, &a1) happens-before
- * @c asio_handler_invoke(b1, &b1).
- * 
- * Note that in the following case:
- * @code async_op_1(..., s.wrap(a));
- * async_op_2(..., s.wrap(b)); @endcode
- * the completion of the first async operation will perform @c s.dispatch(a),
- * and the second will perform @c s.dispatch(b), but the order in which those
- * are performed is unspecified. That is, you cannot state whether one
- * happens-before the other. Therefore none of the above conditions are met and
- * no ordering guarantee is made.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Safe.
- *
- * @par Concepts:
- * Dispatcher.
- */
-class io_service::strand
-{
-public:
-  /// Constructor.
-  /**
-   * Constructs the strand.
-   *
-   * @param io_service The io_service object that the strand will use to
-   * dispatch handlers that are ready to be run.
-   */
-  explicit strand(boost::asio::io_service& io_service)
-    : service_(boost::asio::use_service<
-        boost::asio::detail::strand_service>(io_service))
-  {
-    service_.construct(impl_);
-  }
-
-  /// Destructor.
-  /**
-   * Destroys a strand.
-   *
-   * Handlers posted through the strand that have not yet been invoked will
-   * still be dispatched in a way that meets the guarantee of non-concurrency.
-   */
-  ~strand()
-  {
-    service_.destroy(impl_);
-  }
-
-  /// Get the io_service associated with the strand.
-  /**
-   * This function may be used to obtain the io_service object that the strand
-   * uses to dispatch handlers for asynchronous operations.
-   *
-   * @return A reference to the io_service object that the strand will use to
-   * dispatch handlers. Ownership is not transferred to the caller.
-   */
-  boost::asio::io_service& get_io_service()
-  {
-    return service_.get_io_service();
-  }
-
-  /// Request the strand to invoke the given handler.
-  /**
-   * This function is used to ask the strand to execute the given handler.
-   *
-   * The strand object guarantees that handlers posted or dispatched through
-   * the strand will not be executed concurrently. The handler may be executed
-   * inside this function if the guarantee can be met. If this function is
-   * called from within a handler that was posted or dispatched through the same
-   * strand, then the new handler will be executed immediately.
-   *
-   * The strand's guarantee is in addition to the guarantee provided by the
-   * underlying io_service. The io_service guarantees that the handler will only
-   * be called in a thread in which the io_service's run member function is
-   * currently being invoked.
-   *
-   * @param handler The handler to be called. The strand will make a copy of the
-   * handler object as required. The function signature of the handler must be:
-   * @code void handler(); @endcode
-   */
-  template <typename CompletionHandler>
-  void dispatch(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a CompletionHandler.
-    BOOST_ASIO_COMPLETION_HANDLER_CHECK(CompletionHandler, handler) type_check;
-
-    service_.dispatch(impl_, BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler));
-  }
-
-  /// Request the strand to invoke the given handler and return
-  /// immediately.
-  /**
-   * This function is used to ask the strand to execute the given handler, but
-   * without allowing the strand to call the handler from inside this function.
-   *
-   * The strand object guarantees that handlers posted or dispatched through
-   * the strand will not be executed concurrently. The strand's guarantee is in
-   * addition to the guarantee provided by the underlying io_service. The
-   * io_service guarantees that the handler will only be called in a thread in
-   * which the io_service's run member function is currently being invoked.
-   *
-   * @param handler The handler to be called. The strand will make a copy of the
-   * handler object as required. The function signature of the handler must be:
-   * @code void handler(); @endcode
-   */
-  template <typename CompletionHandler>
-  void post(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a CompletionHandler.
-    BOOST_ASIO_COMPLETION_HANDLER_CHECK(CompletionHandler, handler) type_check;
-
-    service_.post(impl_, BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler));
-  }
-
-  /// Create a new handler that automatically dispatches the wrapped handler
-  /// on the strand.
-  /**
-   * This function is used to create a new handler function object that, when
-   * invoked, will automatically pass the wrapped handler to the strand's
-   * dispatch function.
-   *
-   * @param handler The handler to be wrapped. The strand will make a copy of
-   * the handler object as required. The function signature of the handler must
-   * be: @code void handler(A1 a1, ... An an); @endcode
-   *
-   * @return A function object that, when invoked, passes the wrapped handler to
-   * the strand's dispatch function. Given a function object with the signature:
-   * @code R f(A1 a1, ... An an); @endcode
-   * If this function object is passed to the wrap function like so:
-   * @code strand.wrap(f); @endcode
-   * then the return value is a function object with the signature
-   * @code void g(A1 a1, ... An an); @endcode
-   * that, when invoked, executes code equivalent to:
-   * @code strand.dispatch(boost::bind(f, a1, ... an)); @endcode
-   */
-  template <typename Handler>
-#if defined(GENERATING_DOCUMENTATION)
-  unspecified
-#else
-  detail::wrapped_handler<strand, Handler>
-#endif
-  wrap(Handler handler)
-  {
-    return detail::wrapped_handler<io_service::strand, Handler>(*this, handler);
-  }
-
-private:
-  boost::asio::detail::strand_service& service_;
-  boost::asio::detail::strand_service::implementation_type impl_;
-};
-
-/// Typedef for backwards compatibility.
-typedef boost::asio::io_service::strand strand;
-
-} // namespace asio
-} // namespace boost
-
-#include <boost/asio/detail/pop_options.hpp>
-
-#endif // BOOST_ASIO_STRAND_HPP