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

ipc/mojo/ipc_channel_mojo_unittest.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 "ipc/mojo/ipc_channel_mojo.h"
 
 #include "base/base_paths.h"
 #include "base/files/file.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 533 matching lines @@
 }
 
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(ParamTraitInvalidMessagePipeClient) {
   ParamTraitMessagePipeClient(false, "ParamTraitInvalidMessagePipeClient");
   return 0;
 }
 
 #if defined(OS_WIN)
 class IPCChannelMojoDeadHandleTest : public IPCChannelMojoTestBase {
  protected:
-  virtual scoped_ptr<IPC::ChannelFactory> CreateChannelFactory(
+  scoped_ptr<IPC::ChannelFactory> CreateChannelFactory(
       const IPC::ChannelHandle& handle,
       base::SequencedTaskRunner* runner) override {
     host_.reset(new IPC::ChannelMojoHost(task_runner()));
     return IPC::ChannelMojo::CreateServerFactory(host_->channel_delegate(),
                                                  task_runner(), handle);
   }
 
-  virtual bool DidStartClient() override {
+  bool DidStartClient() override {
     IPCTestBase::DidStartClient();
     const base::ProcessHandle client = client_process().Handle();
     // Forces GetFileHandleForProcess() fail. It happens occasionally
     // in production, so we should exercise it somehow.
     // TODO(morrita): figure out how to safely test this. See crbug.com/464109.
     // ::CloseHandle(client);
     host_->OnClientLaunched(client);
     return true;
   }
 
@@ skipping 201 matching lines @@
   base::MessageLoop::current()->Run();
 
   client.Close();
 
   return 0;
 }
 
 #endif // OS_LINUX
 
 }  // namespace