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

chrome/browser/sync/glue/sync_backend_host.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 "build/build_config.h"
 
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 860 matching lines @@
   if (!host_ || !host_->frontend_)
     return;
 
   DCHECK_EQ(MessageLoop::current(), host_->frontend_loop_);
 
   host_->last_auth_error_ = new_auth_error;
   host_->frontend_->OnAuthError();
 }
 
 void SyncBackendHost::Core::StartSavingChanges() {
-  save_changes_timer_.Start(
+  save_changes_timer_.Start(FROM_HERE,
       base::TimeDelta::FromSeconds(kSaveChangesIntervalSeconds),
       this, &Core::SaveChanges);
 }
 
 void SyncBackendHost::Core::DoRequestClearServerData() {
   sync_manager_->RequestClearServerData();
 }
 
 void SyncBackendHost::Core::DoRequestCleanupDisabledTypes() {
   sync_manager_->RequestCleanupDisabledTypes();
 }
 
 void SyncBackendHost::Core::SaveChanges() {
   sync_manager_->SaveChanges();
 }
 
 void SyncBackendHost::Core::DeleteSyncDataFolder() {
   if (file_util::DirectoryExists(host_->sync_data_folder_path())) {
     if (!file_util::Delete(host_->sync_data_folder_path(), true))
       LOG(DFATAL) << "Could not delete the Sync Data folder.";
   }
 }
 
 }  // namespace browser_sync