Update {virtual,override,final} to follow C++11 style.

android_webview/lib/main/aw_main_delegate.h

 // Copyright (c) 2012 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 ANDROID_WEBVIEW_LIB_MAIN_AW_MAIN_DELEGATE_H_
 #define ANDROID_WEBVIEW_LIB_MAIN_AW_MAIN_DELEGATE_H_
 
 #include "android_webview/browser/jni_dependency_factory.h"
 #include "android_webview/common/aw_content_client.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 
 namespace content {
 class BrowserMainRunner;
 class ExternalVideoSurfaceContainel;
 }
 
 namespace android_webview {
 
 class AwContentBrowserClient;
 class AwContentRendererClient;
 
 // Android WebView implementation of ContentMainDelegate.
 class AwMainDelegate : public content::ContentMainDelegate,
                        public JniDependencyFactory {
  public:
   AwMainDelegate();
-  virtual ~AwMainDelegate();
+  ~AwMainDelegate() override;
 
  private:
   // content::ContentMainDelegate implementation:
   bool BasicStartupComplete(int* exit_code) override;
   void PreSandboxStartup() override;
   void SandboxInitialized(const std::string& process_type) override;
   int RunProcess(
       const std::string& process_type,
       const content::MainFunctionParams& main_function_params) override;
   void ProcessExiting(const std::string& process_type) override;
   content::ContentBrowserClient* CreateContentBrowserClient() override;
   content::ContentRendererClient* CreateContentRendererClient() override;
 
   // JniDependencyFactory implementation.
   scoped_refptr<AwQuotaManagerBridge> CreateAwQuotaManagerBridge(
       AwBrowserContext* browser_context) override;
   content::WebContentsViewDelegate* CreateViewDelegate(
       content::WebContents* web_contents) override;
   AwWebPreferencesPopulater* CreateWebPreferencesPopulater() override;
   AwMessagePortService* CreateAwMessagePortService() override;
 #if defined(VIDEO_HOLE)
-  virtual content::ExternalVideoSurfaceContainer*
-      CreateExternalVideoSurfaceContainer(
-          content::WebContents* web_contents) override;
+  content::ExternalVideoSurfaceContainer* CreateExternalVideoSurfaceContainer(
+      content::WebContents* web_contents) override;
 #endif
 
   scoped_ptr<content::BrowserMainRunner> browser_runner_;
   AwContentClient content_client_;
   scoped_ptr<AwContentBrowserClient> content_browser_client_;
   scoped_ptr<AwContentRendererClient> content_renderer_client_;
 
   DISALLOW_COPY_AND_ASSIGN(AwMainDelegate);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_LIB_MAIN_AW_MAIN_DELEGATE_H_