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

ppapi/shared_impl/ppb_device_ref_shared.h

 // Copyright (c) 2012 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_PPB_DEVICE_REF_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 
 class PPAPI_SHARED_EXPORT PPB_DeviceRef_Shared
     : public Resource,
       public thunk::PPB_DeviceRef_API {
  public:
   PPB_DeviceRef_Shared(ResourceObjectType type,
                        PP_Instance instance,
                        const DeviceRefData& data);
 
   // Resource overrides.
-  virtual PPB_DeviceRef_API* AsPPB_DeviceRef_API() override;
+  PPB_DeviceRef_API* AsPPB_DeviceRef_API() override;
 
   // PPB_DeviceRef_API implementation.
-  virtual const DeviceRefData& GetDeviceRefData() const override;
-  virtual PP_DeviceType_Dev GetType() override;
-  virtual PP_Var GetName() override;
+  const DeviceRefData& GetDeviceRefData() const override;
+  PP_DeviceType_Dev GetType() override;
+  PP_Var GetName() override;
 
  private:
   DeviceRefData data_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PPB_DeviceRef_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_