Standardize usage of virtual/override/final in mojo/

mojo/services/clipboard/main.cc

 // 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.
 
 #include "base/at_exit.h"
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/services/clipboard/clipboard_standalone_impl.h"
 
 class Delegate : public mojo::ApplicationDelegate,
                  public mojo::InterfaceFactory<mojo::Clipboard> {
  public:
   Delegate() {}
-  virtual ~Delegate() {}
+  ~Delegate() override {}
 
   // mojo::ApplicationDelegate implementation.
-  virtual bool ConfigureIncomingConnection(
+  bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) override {
     connection->AddService(this);
     return true;
   }
 
   // mojo::InterfaceFactory<mojo::Clipboard> implementation.
-  virtual void Create(
-      mojo::ApplicationConnection* connection,
-      mojo::InterfaceRequest<mojo::Clipboard> request) override {
+  void Create(mojo::ApplicationConnection* connection,
+              mojo::InterfaceRequest<mojo::Clipboard> request) override {
     // TODO(erg): Write native implementations of the clipboard. For now, we
     // just build a clipboard which doesn't interact with the system.
     mojo::BindToRequest(new mojo::ClipboardStandaloneImpl(), &request);
   }
 };
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(new Delegate);
   return runner.Run(shell_handle);
 }