Remove unused WebThread based code for workers

content/child/worker_task_runner.h

 // Copyright 2014 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_CHILD_WORKER_TASK_RUNNER_H_
 #define CONTENT_CHILD_WORKER_TASK_RUNNER_H_
 
 #include <map>
 
 #include "base/atomic_sequence_num.h"
 #include "base/callback_forward.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_local.h"
 #include "content/common/content_export.h"
-#include "third_party/WebKit/public/platform/WebThread.h"
 #include "third_party/WebKit/public/platform/WebWorkerRunLoop.h"
 
 namespace content {
 
 class CONTENT_EXPORT WorkerTaskRunner {
  public:
   WorkerTaskRunner();
 
   bool PostTask(int id, const base::Closure& task);
   int PostTaskToAllThreads(const base::Closure& task);
   int CurrentWorkerId();
   static WorkerTaskRunner* Instance();
 
   class CONTENT_EXPORT Observer {
    public:
     virtual ~Observer() {}
     virtual void OnWorkerRunLoopStopped() = 0;
   };
   // Add/Remove an observer that will get notified when the current worker run
   // loop is stopping. This observer will not get notified when other threads
   // are stopping.  It's only valid to call these on a worker thread.
   void AddStopObserver(Observer* observer);
   void RemoveStopObserver(Observer* observer);
 
   void OnWorkerRunLoopStarted(const blink::WebWorkerRunLoop& loop);
   void OnWorkerRunLoopStopped(const blink::WebWorkerRunLoop& loop);
 
-  void OnWorkerThreadStarted(blink::WebThread* thread);
-  void OnWorkerThreadStopped(blink::WebThread* thread);
-
  private:
   friend class WorkerTaskRunnerTest;
 
   typedef std::map<int, blink::WebWorkerRunLoop> IDToLoopMap;
-  typedef std::map<int, blink::WebThread*> IDToThreadMap;
 
   ~WorkerTaskRunner();
 
   struct ThreadLocalState;
   base::ThreadLocalPointer<ThreadLocalState> current_tls_;
 
   base::AtomicSequenceNumber id_sequence_;
   IDToLoopMap loop_map_;
-  IDToThreadMap thread_map_;
   base::Lock loop_map_lock_;
 };
 
 }  // namespace content
 
 #endif // CONTENT_CHILD_WORKER_TASK_RUNNER_H_