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

content/browser/gpu/gpu_internals_ui.cc

Index: content/browser/gpu/gpu_internals_ui.cc
diff --git a/content/browser/gpu/gpu_internals_ui.cc b/content/browser/gpu/gpu_internals_ui.cc
index 8b59931f80ff5b1e7cd16ebb2627f44b157a9fa8..c8758c5476dee82dc62e98455d50ba6a15ef2b88 100644
--- a/content/browser/gpu/gpu_internals_ui.cc
+++ b/content/browser/gpu/gpu_internals_ui.cc
@@ -242,14 +242,14 @@ class GpuMessageHandler
       public GpuDataManagerObserver {
  public:
   GpuMessageHandler();
-  virtual ~GpuMessageHandler();
+  ~GpuMessageHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
   // GpuDataManagerObserver implementation.
-  virtual void OnGpuInfoUpdate() override;
-  virtual void OnGpuSwitching() override;
+  void OnGpuInfoUpdate() override;
+  void OnGpuSwitching() override;
 
   // Messages
   void OnBrowserBridgeInitialized(const base::ListValue* list);