Update base/timer.h code to pass through Location from call sites.

content/browser/download/download_file_manager.cc

 // Copyright (c) 2011 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 "content/browser/download/download_file_manager.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/task.h"
@@ skipping 71 matching lines @@
 
 DownloadFile* DownloadFileManager::GetDownloadFile(int id) {
   DownloadFileMap::iterator it = downloads_.find(id);
   return it == downloads_.end() ? NULL : it->second;
 }
 
 void DownloadFileManager::StartUpdateTimer() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   if (!update_timer_.IsRunning()) {
     update_timer_.Start(base::TimeDelta::FromMilliseconds(kUpdatePeriodMs),
-                        this, &DownloadFileManager::UpdateInProgressDownloads);
+                        this, &DownloadFileManager::UpdateInProgressDownloads,
+                        FROM_HERE);
   }
 }
 
 void DownloadFileManager::StopUpdateTimer() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   update_timer_.Stop();
 }
 
 void DownloadFileManager::UpdateInProgressDownloads() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
@@ skipping 327 matching lines @@
            << " id = " << id
            << " download_file = " << download_file->DebugString();
 
   downloads_.erase(id);
 
   delete download_file;
 
   if (downloads_.empty())
     StopUpdateTimer();
 }