Standardize usage of virtual/override/final in mojo/

mojo/shell/context.cc

 // 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.
 
 #include "mojo/shell/context.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 81 matching lines @@
       LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
                  << ": '" << parts[i + 1] << "' is not a valid URL.";
       return;
     }
     loader->RegisterContentHandler(parts[i], url);
   }
 }
 
 class EmptyServiceProvider : public InterfaceImpl<ServiceProvider> {
  private:
-  virtual void ConnectToService(
-      const mojo::String& service_name,
-      ScopedMessagePipeHandle client_handle) override {}
+  void ConnectToService(const mojo::String& service_name,
+                        ScopedMessagePipeHandle client_handle) override {}
 };
 
 }  // namespace
 
 #if defined(OS_ANDROID)
 class Context::NativeViewportApplicationLoader
     : public ApplicationLoader,
       public ApplicationDelegate,
       public InterfaceFactory<NativeViewport>,
       public InterfaceFactory<Gpu> {
@@ skipping 147 matching lines @@
 ScopedMessagePipeHandle Context::ConnectToServiceByName(
     const GURL& application_url,
     const std::string& service_name) {
   app_urls_.insert(application_url);
   return application_manager_.ConnectToServiceByName(
       application_url, service_name).Pass();
 }
 
 }  // namespace shell
 }  // namespace mojo