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diff --git a/deps/v8/src/dtoa.h b/deps/v8/src/dtoa.h
deleted file mode 100644
index 53968561fa..0000000000
--- a/deps/v8/src/dtoa.h
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2011 the V8 project 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 V8_DTOA_H_
-#define V8_DTOA_H_
-
-#include "src/vector.h"
-
-namespace v8 {
-namespace internal {
-
-enum DtoaMode {
-  // Return the shortest correct representation.
-  // For example the output of 0.299999999999999988897 is (the less accurate but
-  // correct) 0.3.
-  DTOA_SHORTEST,
-  // Return a fixed number of digits after the decimal point.
-  // For instance fixed(0.1, 4) becomes 0.1000
-  // If the input number is big, the output will be big.
-  DTOA_FIXED,
-  // Return a fixed number of digits, no matter what the exponent is.
-  DTOA_PRECISION
-};
-
-// The maximal length of digits a double can have in base 10.
-// Note that DoubleToAscii null-terminates its input. So the given buffer should
-// be at least kBase10MaximalLength + 1 characters long.
-const int kBase10MaximalLength = 17;
-
-// Converts the given double 'v' to ASCII.
-// The result should be interpreted as buffer * 10^(point-length).
-//
-// The output depends on the given mode:
-//  - SHORTEST: produce the least amount of digits for which the internal
-//   identity requirement is still satisfied. If the digits are printed
-//   (together with the correct exponent) then reading this number will give
-//   'v' again. The buffer will choose the representation that is closest to
-//   'v'. If there are two at the same distance, than the one farther away
-//   from 0 is chosen (halfway cases - ending with 5 - are rounded up).
-//   In this mode the 'requested_digits' parameter is ignored.
-//  - FIXED: produces digits necessary to print a given number with
-//   'requested_digits' digits after the decimal point. The produced digits
-//   might be too short in which case the caller has to fill the gaps with '0's.
-//   Example: toFixed(0.001, 5) is allowed to return buffer="1", point=-2.
-//   Halfway cases are rounded towards +/-Infinity (away from 0). The call
-//   toFixed(0.15, 2) thus returns buffer="2", point=0.
-//   The returned buffer may contain digits that would be truncated from the
-//   shortest representation of the input.
-//  - PRECISION: produces 'requested_digits' where the first digit is not '0'.
-//   Even though the length of produced digits usually equals
-//   'requested_digits', the function is allowed to return fewer digits, in
-//   which case the caller has to fill the missing digits with '0's.
-//   Halfway cases are again rounded away from 0.
-// 'DoubleToAscii' expects the given buffer to be big enough to hold all digits
-// and a terminating null-character. In SHORTEST-mode it expects a buffer of
-// at least kBase10MaximalLength + 1. Otherwise, the size of the output is
-// limited to requested_digits digits plus the null terminator.
-V8_EXPORT_PRIVATE void DoubleToAscii(double v, DtoaMode mode,
-                                     int requested_digits, Vector<char> buffer,
-                                     int* sign, int* length, int* point);
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_DTOA_H_