Remove symbol preparse data altogether.

src/preparse-data-format.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_PREPARSE_DATA_FORMAT_H_
 #define V8_PREPARSE_DATA_FORMAT_H_
 
 namespace v8 {
 namespace internal {
 
 // Generic and general data used by preparse data recorders and readers.
 
 struct PreparseDataConstants {
  public:
   // Layout and constants of the preparse data exchange format.
   static const unsigned kMagicNumber = 0xBadDead;
-  static const unsigned kCurrentVersion = 8;
+  static const unsigned kCurrentVersion = 9;
 
   static const int kMagicOffset = 0;
   static const int kVersionOffset = 1;
   static const int kHasErrorOffset = 2;
   static const int kFunctionsSizeOffset = 3;
-  static const int kSymbolCountOffset = 4;
-  static const int kSizeOffset = 5;
-  static const int kHeaderSize = 6;
+  static const int kSizeOffset = 4;
+  static const int kHeaderSize = 5;
 
   // If encoding a message, the following positions are fixed.
   static const int kMessageStartPos = 0;
   static const int kMessageEndPos = 1;
   static const int kMessageArgCountPos = 2;
   static const int kIsReferenceErrorPos = 3;
   static const int kMessageTextPos = 4;
 
   static const unsigned char kNumberTerminator = 0x80u;
 };
 
 
 } }  // namespace v8::internal.
 
 #endif  // V8_PREPARSE_DATA_FORMAT_H_