Remove grab-bag includes of v8.h from everywhere.

src/fast-dtoa.h

 // 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_FAST_DTOA_H_
 #define V8_FAST_DTOA_H_
 
+#include "src/vector.h"
+
 namespace v8 {
 namespace internal {
 
 enum FastDtoaMode {
   // Computes the shortest representation of the given input. The returned
   // result will be the most accurate number of this length. Longer
   // representations might be more accurate.
   FAST_DTOA_SHORTEST,
   // Computes a representation where the precision (number of digits) is
   // given as input. The precision is independent of the decimal point.
@@ skipping 33 matching lines @@
 bool FastDtoa(double d,
               FastDtoaMode mode,
               int requested_digits,
               Vector<char> buffer,
               int* length,
               int* decimal_point);
 
 } }  // namespace v8::internal
 
 #endif  // V8_FAST_DTOA_H_