Code re-factor related to WeakPtrFactory in src/component module

components/storage_monitor/volume_mount_watcher_win.cc

 // 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.
 
 #include "components/storage_monitor/volume_mount_watcher_win.h"
 
 #include <windows.h>
 
 #include <dbt.h>
 #include <fileapi.h>
@@ skipping 312 matching lines @@
 }
 
 }  // namespace
 
 const int kWorkerPoolNumThreads = 3;
 const char* kWorkerPoolNamePrefix = "DeviceInfoPool";
 
 VolumeMountWatcherWin::VolumeMountWatcherWin()
     : device_info_worker_pool_(new base::SequencedWorkerPool(
           kWorkerPoolNumThreads, kWorkerPoolNamePrefix)),
-      weak_factory_(this),
-      notifications_(NULL) {
+      notifications_(NULL),
+      weak_factory_(this) {
   task_runner_ =
       device_info_worker_pool_->GetSequencedTaskRunnerWithShutdownBehavior(
           device_info_worker_pool_->GetSequenceToken(),
           base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
 }
 
 // static
 base::FilePath VolumeMountWatcherWin::DriveNumberToFilePath(int drive_number) {
   if (drive_number < 0 || drive_number > 25)
     return base::FilePath();
@@ skipping 202 matching lines @@
     callback.Run(StorageMonitor::EJECT_FAILURE);
     return;
   }
 
   task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&EjectDeviceInThreadPool, device, callback, task_runner_, 0));
 }
 
 }  // namespace storage_monitor