Standardize usage of virtual/override/final in content/renderer/

content/renderer/memory_benchmarking_extension.h

 // Copyright (c) 2013 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 CONTENT_RENDERER_MEMORY_BENCHMARKING_EXTENSION_H_
 #define CONTENT_RENDERER_MEMORY_BENCHMARKING_EXTENSION_H_
 
 #include "base/basictypes.h"
 #include "gin/wrappable.h"
 
 namespace blink {
 class WebFrame;
 }
 
 namespace gin {
 class Arguments;
 }
 
 namespace content {
 
 class MemoryBenchmarkingExtension
     : public gin::Wrappable<MemoryBenchmarkingExtension> {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
   static void Install(blink::WebFrame* frame);
 
  private:
   MemoryBenchmarkingExtension();
-  virtual ~MemoryBenchmarkingExtension();
+  ~MemoryBenchmarkingExtension() override;
 
   // gin::Wrappable.
-  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
   bool IsHeapProfilerRunning();
 
   void HeapProfilerDump(gin::Arguments* args);
 
   DISALLOW_COPY_AND_ASSIGN(MemoryBenchmarkingExtension);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEMORY_BENCHMARKING_EXTENSION_H_