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

ppapi/proxy/output_protection_resource.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_PROXY_OUTPUT_PROTECTION_RESOURCE_H_
 #define PPAPI_PROXY_OUTPUT_PROTECTION_RESOURCE_H_
 
 #include "base/compiler_specific.h"
 #include "ppapi/c/private/ppb_output_protection_private.h"
 #include "ppapi/proxy/device_enumeration_resource_helper.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/thunk/ppb_output_protection_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class OutputProtectionResource
     : public PluginResource,
       public ::ppapi::thunk::PPB_OutputProtection_API {
  public:
   OutputProtectionResource(Connection connection,
                            PP_Instance instance);
 
  private:
-  virtual ~OutputProtectionResource();
+  ~OutputProtectionResource() override;
 
   // PluginResource overrides.
-  virtual thunk::PPB_OutputProtection_API* AsPPB_OutputProtection_API()
-      override;
+  thunk::PPB_OutputProtection_API* AsPPB_OutputProtection_API() override;
 
   // PPB_OutputProtection_API implementation.
-  virtual int32_t QueryStatus(
+  int32_t QueryStatus(
       uint32_t* link_mask,
       uint32_t* protection_mask,
       const scoped_refptr<TrackedCallback>& callback) override;
-  virtual int32_t EnableProtection(
+  int32_t EnableProtection(
       uint32_t desired_method_mask,
       const scoped_refptr<TrackedCallback>& callback) override;
 
   void OnPluginMsgQueryStatusReply(
       uint32_t* out_link_mask,
       uint32_t* out_protection_mask,
       const ResourceMessageReplyParams& params,
       uint32_t link_mask,
       uint32_t protection_mask);
   void OnPluginMsgEnableProtectionReply(
       const ResourceMessageReplyParams& params);
 
   scoped_refptr<TrackedCallback> query_status_callback_;
   scoped_refptr<TrackedCallback> enable_protection_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputProtectionResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_OUTPUT_PROTECTION_RESOURCE_H_