Reland of Use a token to initialise ChannelMojo and MojoApplication everywhere.

content/common/mojo/channel_init.cc

-// Copyright 2015 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 "content/common/mojo/channel_init.h"
-
-#include <utility>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/command_line.h"
-#include "base/lazy_instance.h"
-#include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop.h"
-#include "base/task_runner.h"
-#include "base/thread_task_runner_handle.h"
-#include "mojo/edk/embedder/embedder.h"
-
-namespace content {
-
-ChannelInit::ChannelInit() {}
-
-ChannelInit::~ChannelInit() {}
-
-mojo::ScopedMessagePipeHandle ChannelInit::Init(
-    base::PlatformFile file,
-    scoped_refptr<base::TaskRunner> io_thread_task_runner) {
-  return mojo::edk::CreateMessagePipe(
-      mojo::edk::ScopedPlatformHandle(mojo::edk::PlatformHandle(file)));
-}
-
-}  // namespace content