Fix header guards in //chrome

chrome/renderer/benchmarking_extension.h

 // Copyright (c) 2011 The Chromium 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 CHROME_RENDERER_V8_BENCHMARKING_EXTENSION_H_
-#define CHROME_RENDERER_V8_BENCHMARKING_EXTENSION_H_
+#ifndef CHROME_RENDERER_BENCHMARKING_EXTENSION_H_
+#define CHROME_RENDERER_BENCHMARKING_EXTENSION_H_
 
 namespace v8 {
 class Extension;
 }
 
 namespace extensions_v8 {
 
 // Profiler is an extension to allow javascript access to the API for
 // an external profiler program (such as Quantify). The "External" part of the
 // name is to distinguish it from the built-in V8 Profiler.
 class BenchmarkingExtension {
  public:
   static v8::Extension* Get();
 };
 
 }  // namespace extensions_v8
 
-#endif  // CHROME_RENDERER_V8_BENCHMARKING_EXTENSION_H_
+#endif  // CHROME_RENDERER_BENCHMARKING_EXTENSION_H_