Fix crash in update_client::BackgroundDownloader::EndDownload.

components/update_client/background_downloader_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.
 
 #ifndef COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_
 #define COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_
 
 #include <windows.h>
 #include <bits.h>
 
@@ skipping 67 matching lines @@
   // the state is final, or false, if the download is allowed to continue.
   bool OnStateTransientError();
 
   // Handles the job state corresponding to transferring data. Returns false
   // always since this is never a final state.
   bool OnStateTransferring();
 
   void StartTimer();
   void OnTimer();
 
+  // Returns true if the timer is running or false if the timer is not
+  // created or not running at all.
+  bool TimerIsRunning() const;
+
   HRESULT QueueBitsJob(const GURL& url, IBackgroundCopyJob** job);
   HRESULT CreateOrOpenJob(const GURL& url, IBackgroundCopyJob** job);
   HRESULT InitializeNewJob(
       const base::win::ScopedComPtr<IBackgroundCopyJob>& job,
       const GURL& url);
 
   // Returns true if at the time of the call, it appears that the job
   // has not been making progress toward completion.
   bool IsStuck();
 
@@ skipping 39 matching lines @@
 
   // Contains the path of the downloaded file if the download was successful.
   base::FilePath response_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundDownloader);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_