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

ppapi/proxy/dispatcher.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_PROXY_DISPATCHER_H_
 #define PPAPI_PROXY_DISPATCHER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 30 matching lines @@
 //                                      |
 //    "Source"                          |    "Target"
 //    InterfaceProxy ----------------------> InterfaceProxy
 //                                      |
 //                                      |
 //    "Target"                          |    "Source"
 //    InterfaceProxy <---------------------- InterfaceProxy
 //                                      |
 class PPAPI_PROXY_EXPORT Dispatcher : public ProxyChannel {
  public:
-  virtual ~Dispatcher();
+  ~Dispatcher() override;
 
   // Returns true if the dispatcher is on the plugin side, or false if it's the
   // browser side.
   virtual bool IsPlugin() const = 0;
 
   VarSerializationRules* serialization_rules() const {
     return serialization_rules_.get();
   }
 
   // Returns a non-owning pointer to the interface proxy for the given ID, or
   // NULL if the ID isn't found. This will create the proxy if it hasn't been
   // created so far.
   InterfaceProxy* GetInterfaceProxy(ApiID id);
 
   // Adds the given filter to the IO thread.
   void AddIOThreadMessageFilter(scoped_refptr<IPC::MessageFilter> filter);
 
   // IPC::Listener implementation.
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   PP_GetInterface_Func local_get_interface() const {
     return local_get_interface_;
   }
 
   const PpapiPermissions& permissions() const { return permissions_; }
 
  protected:
   explicit Dispatcher(PP_GetInterface_Func local_get_interface,
                       const PpapiPermissions& permissions);
@@ skipping 18 matching lines @@
 
   PpapiPermissions permissions_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_DISPATCHER_H_