Hotlist Slow: Remove extra thread pool created by VolumeMountWatcherWin.

components/storage_monitor/test_volume_mount_watcher_win.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.
 //
 // This file contains a subclass of VolumeMountWatcherWin to expose some
 // functionality for testing.
 
 #ifndef COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_
 #define COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_
 
@@ skipping 35 matching lines @@
 
   void ReleaseDeviceCheck();
 
   // VolumeMountWatcherWin:
   virtual void DeviceCheckComplete(const base::FilePath& device_path) override;
   virtual GetAttachedDevicesCallbackType
       GetAttachedDevicesCallback() const override;
   virtual GetDeviceDetailsCallbackType
       GetDeviceDetailsCallback() const override;
 
-  // Should be used by unit tests to make sure the worker pool doesn't survive
-  // into other test runs.
-  void ShutdownWorkerPool();
-
  private:
   std::vector<base::FilePath> devices_checked_;
   scoped_ptr<base::WaitableEvent> device_check_complete_event_;
   bool attached_devices_fake_;
 
   DISALLOW_COPY_AND_ASSIGN(TestVolumeMountWatcherWin);
 };
 
 }  // namespace storage_monitor
 
 #endif  // COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_