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

content/renderer/pepper/pepper_graphics_2d_host.h

Index: content/renderer/pepper/pepper_graphics_2d_host.h
diff --git a/content/renderer/pepper/pepper_graphics_2d_host.h b/content/renderer/pepper/pepper_graphics_2d_host.h
index d5753ccda4f7f4e0159e9b990afa3f0d531c4fd4..7347a0ace3d7dcd19c614dde9fb2068c4e848d5e 100644
--- a/content/renderer/pepper/pepper_graphics_2d_host.h
+++ b/content/renderer/pepper/pepper_graphics_2d_host.h
@@ -51,13 +51,13 @@ class CONTENT_EXPORT PepperGraphics2DHost
       PP_Bool is_always_opaque,
       scoped_refptr<PPB_ImageData_Impl> backing_store);
 
-  virtual ~PepperGraphics2DHost();
+  ~PepperGraphics2DHost() override;
 
   // ppapi::host::ResourceHost override.
-  virtual int32_t OnResourceMessageReceived(
+  int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) override;
-  virtual bool IsGraphics2DHost() override;
+  bool IsGraphics2DHost() override;
 
   bool ReadImageData(PP_Resource image, const PP_Point* top_left);
   // Assciates this device with the given plugin instance. You can pass NULL