Changing the aging mechanism for script and eval caches.

src/compilation-cache.h

 // Copyright 2012 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_COMPILATION_CACHE_H_
 #define V8_COMPILATION_CACHE_H_
 
 namespace v8 {
 namespace internal {
 
@@ skipping 71 matching lines @@
            Handle<Context> context,
            Handle<SharedFunctionInfo> function_info);
 
  private:
   bool HasOrigin(Handle<SharedFunctionInfo> function_info,
                  Handle<Object> name,
                  int line_offset,
                  int column_offset,
                  bool is_shared_cross_origin);
 
-  void* script_histogram_;
-  bool script_histogram_initialized_;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheScript);
 };
 
 
 // Sub-cache for eval scripts. Two caches for eval are used. One for eval calls
 // in native contexts and one for eval calls in other contexts. The cache
 // considers the following pieces of information when checking for matching
 // entries:
 // 1. The source string.
 // 2. The shared function info of the calling function.
@@ skipping 126 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationCache);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILATION_CACHE_H_