Revert 116816 - Hook up the SequencedWorkerPool to the browser thread.

content/browser/browser_thread_impl.h

 // Copyright (c) 2012 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_BROWSER_THREAD_IMPL_H_
 #define CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_
 #pragma once
 
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
 
 class CONTENT_EXPORT BrowserThreadImpl
     : public BrowserThread, public base::Thread {
  public:
   // Construct a BrowserThreadImpl with the supplied identifier.  It is an error
   // to construct a BrowserThreadImpl that already exists.
   explicit BrowserThreadImpl(BrowserThread::ID identifier);
 
   // Special constructor for the main (UI) thread and unittests. We use a dummy
   // thread here since the main thread already exists.
   BrowserThreadImpl(BrowserThread::ID identifier, MessageLoop* message_loop);
   virtual ~BrowserThreadImpl();
 
-  static void ShutdownThreadPool();
-
  protected:
   virtual void Init() OVERRIDE;
   virtual void CleanUp() OVERRIDE;
 
  private:
   // We implement all the functionality of the public BrowserThread
   // functions, but state is stored in the BrowserThreadImpl to keep
   // the API cleaner. Therefore make BrowserThread a friend class.
   friend class BrowserThread;
 
   static bool PostTaskHelper(
       BrowserThread::ID identifier,
       const tracked_objects::Location& from_here,
       const base::Closure& task,
       int64 delay_ms,
       bool nestable);
 
   // Common initialization code for the constructors.
   void Initialize();
 
   // The identifier of this thread.  Only one thread can exist with a given
   // identifier at a given time.
   ID identifier_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_