Remove parts of //cc we aren't using

cc/trees/blocking_task_runner.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 "cc/trees/blocking_task_runner.h"
-
-#include <utility>
-
-#include "base/callback.h"
-#include "base/logging.h"
-#include "base/message_loop/message_loop_proxy.h"
-
-namespace cc {
-
-// static
-scoped_ptr<BlockingTaskRunner> BlockingTaskRunner::Create(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  return make_scoped_ptr(new BlockingTaskRunner(task_runner));
-}
-
-BlockingTaskRunner::BlockingTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : thread_id_(base::PlatformThread::CurrentId()),
-      task_runner_(task_runner),
-      capture_(0) {
-}
-
-BlockingTaskRunner::~BlockingTaskRunner() {}
-
-bool BlockingTaskRunner::BelongsToCurrentThread() {
-  return base::PlatformThread::CurrentId() == thread_id_;
-}
-
-bool BlockingTaskRunner::PostTask(const tracked_objects::Location& from_here,
-                                  const base::Closure& task) {
-  base::AutoLock lock(lock_);
-  DCHECK(task_runner_.get() || capture_);
-  if (!capture_)
-    return task_runner_->PostTask(from_here, task);
-  captured_tasks_.push_back(task);
-  return true;
-}
-
-void BlockingTaskRunner::SetCapture(bool capture) {
-  DCHECK(BelongsToCurrentThread());
-
-  std::vector<base::Closure> tasks;
-
-  {
-    base::AutoLock lock(lock_);
-    capture_ += capture ? 1 : -1;
-    DCHECK_GE(capture_, 0);
-
-    if (capture_)
-      return;
-
-    // We're done capturing, so grab all the captured tasks and run them.
-    tasks.swap(captured_tasks_);
-  }
-  for (size_t i = 0; i < tasks.size(); ++i)
-    tasks[i].Run();
-}
-
-BlockingTaskRunner::CapturePostTasks::CapturePostTasks(
-    BlockingTaskRunner* blocking_runner)
-    : blocking_runner_(blocking_runner) {
-  blocking_runner_->SetCapture(true);
-}
-
-BlockingTaskRunner::CapturePostTasks::~CapturePostTasks() {
-  blocking_runner_->SetCapture(false);
-}
-
-}  // namespace cc