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

android_webview/lib/aw_browser_dependency_factory_impl.h

Index: android_webview/lib/aw_browser_dependency_factory_impl.h
diff --git a/android_webview/lib/aw_browser_dependency_factory_impl.h b/android_webview/lib/aw_browser_dependency_factory_impl.h
index e0cf3b9dd406d0a367fc8330ef7e2d3d5e79506d..c5ca0b129553781d3c52f167e522379fd237f89d 100644
--- a/android_webview/lib/aw_browser_dependency_factory_impl.h
+++ b/android_webview/lib/aw_browser_dependency_factory_impl.h
@@ -22,14 +22,14 @@ class AwURLRequestJobFactory;
 class AwBrowserDependencyFactoryImpl : public AwBrowserDependencyFactory {
  public:
   AwBrowserDependencyFactoryImpl();
-  virtual ~AwBrowserDependencyFactoryImpl();
+  ~AwBrowserDependencyFactoryImpl() override;
 
   // Sets this class as the singleton instance.
   static void InstallInstance();
 
   // AwBrowserDependencyFactory
-  virtual content::BrowserContext* GetBrowserContext() override;
-  virtual content::WebContents* CreateWebContents() override;
+  content::BrowserContext* GetBrowserContext() override;
+  content::WebContents* CreateWebContents() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AwBrowserDependencyFactoryImpl);