Fix crash in update_client::BackgroundDownloader::EndDownload.

components/update_client/background_downloader_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/update_client/background_downloader_win.h"
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <stddef.h>
 
@@ skipping 426 matching lines @@
                 this, &BackgroundDownloader::OnTimer);
 }
 
 void BackgroundDownloader::OnTimer() {
   DCHECK(thread_checker_.CalledOnValidThread());
   task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&BackgroundDownloader::OnDownloading, base::Unretained(this)));
 }
 
+bool BackgroundDownloader::TimerIsRunning() const {
+  return timer_.get() && timer_->IsRunning();
+}
+
 void BackgroundDownloader::DoStartDownload(const GURL& url) {
   DCHECK(thread_checker_.CalledOnValidThread());
   task_runner()->PostTask(FROM_HERE,
                           base::Bind(&BackgroundDownloader::BeginDownload,
                                      base::Unretained(this), url));
 }
 
 // Called one time when this class is asked to do a download.
 void BackgroundDownloader::BeginDownload(const GURL& url) {
   DCHECK(task_runner()->RunsTasksOnCurrentThread());
@@ skipping 102 matching lines @@
   main_task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&BackgroundDownloader::StartTimer, base::Unretained(this)));
 }
 
 // Completes the BITS download, picks up the file path of the response, and
 // notifies the CrxDownloader. The function should be called only once.
 void BackgroundDownloader::EndDownload(HRESULT error) {
   DCHECK(task_runner()->RunsTasksOnCurrentThread());
 
-  DCHECK(!timer_->IsRunning());
+  DCHECK(!TimerIsRunning());
 
   const base::Time download_end_time(base::Time::Now());
   const base::TimeDelta download_time =
       download_end_time >= download_start_time_
           ? download_end_time - download_start_time_
           : base::TimeDelta();
 
   int64_t downloaded_bytes = -1;
   int64_t total_bytes = -1;
   GetJobByteCount(job_.get(), &downloaded_bytes, &total_bytes);
@@ skipping 290 matching lines @@
 
   for (auto cookie : cookies) {
     hr = git->RevokeInterfaceFromGlobal(cookie);
     DCHECK(SUCCEEDED(hr));
   }
 
   return S_OK;
 }
 
 }  // namespace update_client