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

src/scanner-character-streams.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_SCANNER_CHARACTER_STREAMS_H_
 #define V8_SCANNER_CHARACTER_STREAMS_H_
 
+#include "src/handles.h"
 #include "src/scanner.h"
+#include "src/vector.h"
 
 namespace v8 {
 namespace internal {
 
+// Forward declarations.
+class ExternalTwoByteString;
+
 // A buffered character stream based on a random access character
 // source (ReadBlock can be called with pos_ pointing to any position,
 // even positions before the current).
 class BufferedUtf16CharacterStream: public Utf16CharacterStream {
  public:
   BufferedUtf16CharacterStream();
   virtual ~BufferedUtf16CharacterStream();
 
   virtual void PushBack(uc32 character);
 
@@ skipping 147 matching lines @@
 
  private:
   static const size_t kNoBookmark = -1;
 
   size_t bookmark_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_CHARACTER_STREAMS_H_