Standardize usage of virtual/override/final specifiers.

extensions/shell/renderer/shell_content_renderer_client.cc

 // Copyright 2014 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.
 
 #include "extensions/shell/renderer/shell_content_renderer_client.h"
 
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/public/renderer/render_frame_observer_tracker.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 21 matching lines @@
 
 namespace {
 
 // TODO: promote ExtensionFrameHelper to a common place and share with this.
 class ShellFrameHelper
     : public content::RenderFrameObserver,
       public content::RenderFrameObserverTracker<ShellFrameHelper> {
  public:
   ShellFrameHelper(content::RenderFrame* render_frame,
                    Dispatcher* extension_dispatcher);
-  virtual ~ShellFrameHelper();
+  ~ShellFrameHelper() override;
 
   // RenderFrameObserver implementation.
-  virtual void WillReleaseScriptContext(v8::Handle<v8::Context>,
-                                        int world_id) override;
+  void WillReleaseScriptContext(v8::Handle<v8::Context>, int world_id) override;
 
  private:
   Dispatcher* extension_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellFrameHelper);
 };
 
 ShellFrameHelper::ShellFrameHelper(content::RenderFrame* render_frame,
                                    Dispatcher* extension_dispatcher)
     : content::RenderFrameObserver(render_frame),
@@ skipping 119 matching lines @@
 }
 
 content::BrowserPluginDelegate*
 ShellContentRendererClient::CreateBrowserPluginDelegate(
     content::RenderFrame* render_frame,
     const std::string& mime_type) {
   return new extensions::GuestViewContainer(render_frame, mime_type);
 }
 
 }  // namespace extensions