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

ppapi/proxy/uma_private_resource.h

 // Copyright 2014 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_UMA_PRIVATE_RESOURCE_H_
 #define PPAPI_PROXY_UMA_PRIVATE_RESOURCE_H_
 
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/thunk/ppb_uma_singleton_api.h"
 
 namespace ppapi {
 
 namespace proxy {
 
 class PPAPI_PROXY_EXPORT UMAPrivateResource
     : public PluginResource,
       public thunk::PPB_UMA_Singleton_API {
  public:
   UMAPrivateResource(Connection connection, PP_Instance instance);
-  virtual ~UMAPrivateResource();
+  ~UMAPrivateResource() override;
 
   // Resource overrides.
-  virtual thunk::PPB_UMA_Singleton_API* AsPPB_UMA_Singleton_API() override;
+  thunk::PPB_UMA_Singleton_API* AsPPB_UMA_Singleton_API() override;
 
   // PPB_UMA_Singleton_API implementation.
-  virtual void HistogramCustomTimes(PP_Instance instance,
-                                    struct PP_Var name,
-                                    int64_t sample,
-                                    int64_t min,
-                                    int64_t max,
-                                    uint32_t bucket_count) override;
+  void HistogramCustomTimes(PP_Instance instance,
+                            struct PP_Var name,
+                            int64_t sample,
+                            int64_t min,
+                            int64_t max,
+                            uint32_t bucket_count) override;
 
-  virtual void HistogramCustomCounts(PP_Instance instance,
-                                     struct PP_Var name,
-                                     int32_t sample,
-                                     int32_t min,
-                                     int32_t max,
-                                     uint32_t bucket_count) override;
+  void HistogramCustomCounts(PP_Instance instance,
+                             struct PP_Var name,
+                             int32_t sample,
+                             int32_t min,
+                             int32_t max,
+                             uint32_t bucket_count) override;
 
-  virtual void HistogramEnumeration(PP_Instance instance,
-                                    struct PP_Var name,
-                                    int32_t sample,
-                                    int32_t boundary_value) override;
+  void HistogramEnumeration(PP_Instance instance,
+                            struct PP_Var name,
+                            int32_t sample,
+                            int32_t boundary_value) override;
 
-  virtual int32_t IsCrashReportingEnabled(
+  int32_t IsCrashReportingEnabled(
       PP_Instance instance,
       scoped_refptr<TrackedCallback> callback) override;
 
  private:
   void OnPluginMsgIsCrashReportingEnabled(
       const ResourceMessageReplyParams& params);
   scoped_refptr<TrackedCallback> pending_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(UMAPrivateResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_UMA_PRIVATE_RESOURCE_H_