Remove ModelSafeWorker::work_done_or_stopped().

components/sync/engine/model_safe_worker.h

 // Copyright 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 COMPONENTS_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 #define COMPONENTS_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
-#include "base/synchronization/waitable_event.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/base/syncer_error.h"
 
 namespace base {
 class DictionaryValue;
 }  // namespace base
 
 namespace syncer {
 
 typedef base::Callback<enum SyncerError(void)> WorkCallback;
@@ skipping 64 matching lines @@
 
  protected:
   explicit ModelSafeWorker(WorkerLoopDestructionObserver* observer);
   ~ModelSafeWorker() override;
 
   // Any time the Syncer performs model modifications (e.g employing a
   // WriteTransaction), it should be done by this method to ensure it is done
   // from a model-safe thread.
   virtual SyncerError DoWorkAndWaitUntilDoneImpl(const WorkCallback& work) = 0;
 
-  base::WaitableEvent* work_done_or_stopped() { return &work_done_or_stopped_; }
-
   // Return true if the worker was stopped. Thread safe.
   bool IsStopped();
 
   // Subclass should call this in RegisterForLoopDestruction() from the loop
   // where work is done.
   void SetWorkingLoopToCurrent();
 
  private:
   friend class base::RefCountedThreadSafe<ModelSafeWorker>;
 
   void UnregisterForLoopDestructionAsync(
       base::Callback<void(ModelSafeGroup)> unregister_done_callback);
 
   // Whether the worker should/can do more work. Set when sync is disabled or
   // when the worker's working thread is to be destroyed.
   base::Lock stopped_lock_;
   bool stopped_;
 
-  // Signal set when work on native thread is finished or when native thread
-  // is to be destroyed so no more work can be done.
-  base::WaitableEvent work_done_or_stopped_;
-
   // Notified when working thread of the worker is to be destroyed.
   WorkerLoopDestructionObserver* observer_;
 
   // Remember working loop for posting task to unregister destruction
   // observation from sync thread when shutting down sync.
   base::Lock working_task_runner_lock_;
   scoped_refptr<base::SingleThreadTaskRunner> working_task_runner_;
 
   // Callback passed with UnregisterForLoopDestruction. Normally this
   // remains unset/unused and is stored only if |working_task_runner_| isn't
@@ skipping 16 matching lines @@
     const ModelSafeRoutingInfo& routing_info);
 
 ModelTypeSet GetRoutingInfoTypes(const ModelSafeRoutingInfo& routing_info);
 
 ModelSafeGroup GetGroupForModelType(const ModelType type,
                                     const ModelSafeRoutingInfo& routes);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_MODEL_SAFE_WORKER_H_