cc: Remove cc::Thread and cc::ThreadImpl.

cc/base/thread_impl.cc

-// Copyright 2011 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 "cc/base/thread_impl.h"
-
-#include "base/message_loop.h"
-
-namespace cc {
-
-scoped_ptr<Thread> ThreadImpl::CreateForCurrentThread() {
-  return scoped_ptr<Thread>(
-      new ThreadImpl(base::MessageLoopProxy::current())).Pass();
-}
-
-scoped_ptr<Thread> ThreadImpl::CreateForDifferentThread(
-    scoped_refptr<base::MessageLoopProxy> thread) {
-  return scoped_ptr<Thread>(new ThreadImpl(thread)).Pass();
-}
-
-ThreadImpl::~ThreadImpl() {}
-
-void ThreadImpl::PostTask(base::Closure cb) {
-  thread_->PostTask(FROM_HERE, cb);
-}
-
-void ThreadImpl::PostDelayedTask(base::Closure cb, base::TimeDelta delay) {
-  thread_->PostDelayedTask(FROM_HERE, cb, delay);
-}
-
-bool ThreadImpl::BelongsToCurrentThread() const {
-  return thread_->BelongsToCurrentThread();
-}
-
-base::SingleThreadTaskRunner* ThreadImpl::TaskRunner() {
-  return thread_.get();
-}
-
-ThreadImpl::ThreadImpl(scoped_refptr<base::MessageLoopProxy> thread)
-    : thread_(thread) {}
-
-}  // namespace cc