Release password store on UI loop when worker is stopped so that password

chrome/browser/sync/glue/password_model_worker.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 CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_WORKER_H_
 #define CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_WORKER_H_
 
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 
 #include "base/basictypes.h"
@@ skipping 13 matching lines @@
 // from the syncapi that need to be fulfilled on the password thread,
 // which is the DB thread on Linux and Windows.
 class PasswordModelWorker : public syncer::ModelSafeWorker {
  public:
   PasswordModelWorker(const scoped_refptr<PasswordStore>& password_store,
                       syncer::WorkerLoopDestructionObserver* observer);
 
   // syncer::ModelSafeWorker implementation. Called on syncapi SyncerThread.
   virtual void RegisterForLoopDestruction() OVERRIDE;
   virtual syncer::ModelSafeGroup GetModelSafeGroup() OVERRIDE;
+  virtual void RequestStop() OVERRIDE;
 
  protected:
   virtual syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
       const syncer::WorkCallback& work) OVERRIDE;
 
  private:
   virtual ~PasswordModelWorker();
 
   void CallDoWorkAndSignalTask(
     const syncer::WorkCallback& work,
     base::WaitableEvent* done,
     syncer::SyncerError* error);
 
   // Called on password thread to add PasswordModelWorker as destruction
   // observer.
   void RegisterForPasswordLoopDestruction();
 
+  // |password_store_| is used on password thread but released on UI thread.
+  // Protected by |password_store_lock_|.
+  base::Lock password_store_lock_;
   scoped_refptr<PasswordStore> password_store_;
   DISALLOW_COPY_AND_ASSIGN(PasswordModelWorker);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_WORKER_H_