Standardize usage of virtual/override/final in content/

content/common/gpu/image_transport_surface_calayer_mac.h

Index: content/common/gpu/image_transport_surface_calayer_mac.h
diff --git a/content/common/gpu/image_transport_surface_calayer_mac.h b/content/common/gpu/image_transport_surface_calayer_mac.h
index 59aaf6ffff62df4683dd879a150b45dc8862bd84..1de28b3f97daec03ea56b2d087ded8b8a36260ea 100644
--- a/content/common/gpu/image_transport_surface_calayer_mac.h
+++ b/content/common/gpu/image_transport_surface_calayer_mac.h
@@ -20,18 +20,19 @@ class CALayerStorageProvider
     : public ImageTransportSurfaceFBO::StorageProvider {
  public:
   CALayerStorageProvider(ImageTransportSurfaceFBO* transport_surface);
-  virtual ~CALayerStorageProvider();
+  ~CALayerStorageProvider() override;
 
   // ImageTransportSurfaceFBO::StorageProvider implementation:
-  virtual gfx::Size GetRoundedSize(gfx::Size size) override;
-  virtual bool AllocateColorBufferStorage(
-      CGLContextObj context, GLuint texture,
-      gfx::Size pixel_size, float scale_factor) override;
-  virtual void FreeColorBufferStorage() override;
-  virtual void SwapBuffers(const gfx::Size& size, float scale_factor) override;
-  virtual void WillWriteToBackbuffer() override;
-  virtual void DiscardBackbuffer() override;
-  virtual void SwapBuffersAckedByBrowser(bool disable_throttling) override;
+  gfx::Size GetRoundedSize(gfx::Size size) override;
+  bool AllocateColorBufferStorage(CGLContextObj context,
+                                  GLuint texture,
+                                  gfx::Size pixel_size,
+                                  float scale_factor) override;
+  void FreeColorBufferStorage() override;
+  void SwapBuffers(const gfx::Size& size, float scale_factor) override;
+  void WillWriteToBackbuffer() override;
+  void DiscardBackbuffer() override;
+  void SwapBuffersAckedByBrowser(bool disable_throttling) override;
 
   // Interface to ImageTransportLayer:
   CGLContextObj LayerShareGroupContext();