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diff --git a/chromium/net/http/http_vary_data.h b/chromium/net/http/http_vary_data.h
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+++ b/chromium/net/http/http_vary_data.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_HTTP_HTTP_VARY_DATA_H_
+#define NET_HTTP_HTTP_VARY_DATA_H_
+
+#include "base/md5.h"
+#include "net/base/net_export.h"
+
+class Pickle;
+class PickleIterator;
+
+namespace net {
+
+struct HttpRequestInfo;
+class HttpResponseHeaders;
+
+// Used to implement the HTTP/1.1 Vary header.  This class contains a MD5 hash
+// over the request headers indicated by a Vary header.
+//
+// While RFC 2616 requires strict request header comparisons, it is much
+// cheaper to store a MD5 sum, which should be sufficient.  Storing a hash also
+// avoids messy privacy issues as some of the request headers could hold
+// sensitive data (e.g., cookies).
+//
+// NOTE: This class does not hold onto the contents of the Vary header.
+// Instead, it relies on the consumer to store that and to supply it again to
+// the MatchesRequest function for comparing against future HTTP requests.
+//
+class NET_EXPORT_PRIVATE HttpVaryData {
+ public:
+  HttpVaryData();
+
+  bool is_valid() const { return is_valid_; }
+
+  // Initialize from a request and its corresponding response headers.
+  //
+  // Returns true if a Vary header was found in the response headers and that
+  // Vary header was not empty and did not contain the '*' value.  Upon
+  // success, the object is also marked as valid such that is_valid() will
+  // return true.  Otherwise, false is returned to indicate that this object
+  // is marked as invalid.
+  //
+  bool Init(const HttpRequestInfo& request_info,
+            const HttpResponseHeaders& response_headers);
+
+  // Initialize from a pickle that contains data generated by a call to the
+  // vary data's Persist method.
+  //
+  // Upon success, true is returned and the object is marked as valid such that
+  // is_valid() will return true.  Otherwise, false is returned to indicate
+  // that this object is marked as invalid.
+  //
+  bool InitFromPickle(const Pickle& pickle, PickleIterator* pickle_iter);
+
+  // Call this method to persist the vary data. Illegal to call this on an
+  // invalid object.
+  void Persist(Pickle* pickle) const;
+
+  // Call this method to test if the given request matches the previous request
+  // with which this vary data corresponds.  The |cached_response_headers| must
+  // be the same response headers used to generate this vary data.
+  bool MatchesRequest(const HttpRequestInfo& request_info,
+                      const HttpResponseHeaders& cached_response_headers) const;
+
+ private:
+  // Returns the corresponding request header value.
+  static std::string GetRequestValue(const HttpRequestInfo& request_info,
+                                     const std::string& request_header);
+
+  // Append to the MD5 context for the given request header.
+  static void AddField(const HttpRequestInfo& request_info,
+                       const std::string& request_header,
+                       base::MD5Context* context);
+
+  // A digested version of the request headers corresponding to the Vary header.
+  base::MD5Digest request_digest_;
+
+  // True when request_digest_ contains meaningful data.
+  bool is_valid_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_HTTP_VARY_DATA_H_