Standardize usage of virtual/override/final in content/

content/shell/browser/webkit_test_controller.h

Index: content/shell/browser/webkit_test_controller.h
diff --git a/content/shell/browser/webkit_test_controller.h b/content/shell/browser/webkit_test_controller.h
index f47a277a636d5caf762576f999cf240d253168b5..925a20838fe8ecf694995d14a6ede22fc5f17594 100644
--- a/content/shell/browser/webkit_test_controller.h
+++ b/content/shell/browser/webkit_test_controller.h
@@ -106,7 +106,7 @@ class WebKitTestController : public base::NonThreadSafe,
   static WebKitTestController* Get();
 
   WebKitTestController();
-  virtual ~WebKitTestController();
+  ~WebKitTestController() override;
 
   // True if the controller is ready for testing.
   bool PrepareForLayoutTest(const GURL& test_url,
@@ -132,20 +132,20 @@ class WebKitTestController : public base::NonThreadSafe,
   void DevToolsProcessCrashed();
 
   // WebContentsObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
-  virtual void PluginCrashed(const base::FilePath& plugin_path,
-                             base::ProcessId plugin_pid) override;
-  virtual void RenderViewCreated(RenderViewHost* render_view_host) override;
-  virtual void RenderProcessGone(base::TerminationStatus status) override;
-  virtual void WebContentsDestroyed() override;
+  bool OnMessageReceived(const IPC::Message& message) override;
+  void PluginCrashed(const base::FilePath& plugin_path,
+                     base::ProcessId plugin_pid) override;
+  void RenderViewCreated(RenderViewHost* render_view_host) override;
+  void RenderProcessGone(base::TerminationStatus status) override;
+  void WebContentsDestroyed() override;
 
   // NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details) override;
+  void Observe(int type,
+               const NotificationSource& source,
+               const NotificationDetails& details) override;
 
   // GpuDataManagerObserver implementation.
-  virtual void OnGpuProcessCrashed(base::TerminationStatus exit_code) override;
+  void OnGpuProcessCrashed(base::TerminationStatus exit_code) override;
 
  private:
   enum TestPhase {