Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/browser/dom_storage/dom_storage_task_runner.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
-#include "base/single_thread_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 
 namespace base {
-class SingleThreadTaskRunner;
+class MessageLoopProxy;
 }
 
 namespace content {
 
 // DOMStorage uses two task sequences (primary vs commit) to avoid
 // primary access from queuing up behind commits to disk.
 // * Initialization, shutdown, and administrative tasks are performed as
 //   shutdown-blocking primary sequence tasks.
 // * Tasks directly related to the javascript'able interface are performed
 //   as shutdown-blocking primary sequence tasks.
@@ skipping 40 matching lines @@
 // A derived class used in chromium that utilizes a SequenceWorkerPool
 // under dom_storage specific SequenceTokens. The |delayed_task_loop|
 // is used to delay scheduling on the worker pool.
 class CONTENT_EXPORT DOMStorageWorkerPoolTaskRunner :
       public DOMStorageTaskRunner {
  public:
   DOMStorageWorkerPoolTaskRunner(
       base::SequencedWorkerPool* sequenced_worker_pool,
       base::SequencedWorkerPool::SequenceToken primary_sequence_token,
       base::SequencedWorkerPool::SequenceToken commit_sequence_token,
-      base::SingleThreadTaskRunner* delayed_task_task_runner);
+      base::MessageLoopProxy* delayed_task_loop);
 
   bool PostDelayedTask(const tracked_objects::Location& from_here,
                        const base::Closure& task,
                        base::TimeDelta delay) override;
 
   bool PostShutdownBlockingTask(const tracked_objects::Location& from_here,
                                 SequenceID sequence_id,
                                 const base::Closure& task) override;
 
   bool IsRunningOnSequence(SequenceID sequence_id) const override;
 
  protected:
   ~DOMStorageWorkerPoolTaskRunner() override;
 
  private:
 
   base::SequencedWorkerPool::SequenceToken IDtoToken(SequenceID id) const;
 
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  const scoped_refptr<base::MessageLoopProxy> message_loop_;
   const scoped_refptr<base::SequencedWorkerPool> sequenced_worker_pool_;
   base::SequencedWorkerPool::SequenceToken primary_sequence_token_;
   base::SequencedWorkerPool::SequenceToken commit_sequence_token_;
 };
 
 // A derived class used in unit tests that ignores all delays so
 // we don't block in unit tests waiting for timeouts to expire.
 // There is no distinction between [non]-shutdown-blocking or
 // the primary sequence vs the commit sequence in the mock,
 // all tasks are scheduled on |message_loop| with zero delay.
 class CONTENT_EXPORT MockDOMStorageTaskRunner :
       public DOMStorageTaskRunner {
  public:
-  explicit MockDOMStorageTaskRunner(base::SingleThreadTaskRunner* task_runner);
+  explicit MockDOMStorageTaskRunner(base::MessageLoopProxy* message_loop);
 
   bool PostDelayedTask(const tracked_objects::Location& from_here,
                        const base::Closure& task,
                        base::TimeDelta delay) override;
 
   bool PostShutdownBlockingTask(const tracked_objects::Location& from_here,
                                 SequenceID sequence_id,
                                 const base::Closure& task) override;
 
   bool IsRunningOnSequence(SequenceID sequence_id) const override;
 
  protected:
   ~MockDOMStorageTaskRunner() override;
 
  private:
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  const scoped_refptr<base::MessageLoopProxy> message_loop_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_H_