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

ppapi/shared_impl/resource_var.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_SHARED_IMPL_RESOURCE_VAR_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_VAR_H_
 
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
@@ skipping 23 matching lines @@
   // Gets the message for creating a plugin-side resource. Returns NULL if the
   // message is empty (which is always true on the plugin side).
   virtual const IPC::Message* GetCreationMessage() const;
 
   // Determines whether this is a pending resource.
   // This is true if, on the host side, the there is a creation_message and no
   // PP_Resource.
   virtual bool IsPending() const = 0;
 
   // Var override.
-  virtual ResourceVar* AsResourceVar() override;
-  virtual PP_VarType GetType() const override;
+  ResourceVar* AsResourceVar() override;
+  PP_VarType GetType() const override;
 
   // Helper function that converts a PP_Var to a ResourceVar. This will
   // return NULL if the PP_Var is not of Resource type.
   static ResourceVar* FromPPVar(PP_Var var);
 
  protected:
   ResourceVar();
 
-  virtual ~ResourceVar();
+  ~ResourceVar() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ResourceVar);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_VAR_H_