[Sync] Fix Session's handling of windows.

chrome/browser/sync/glue/synced_session.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 "chrome/browser/sync/glue/synced_session.h"
 
 #include "base/stl_util.h"
 #include "chrome/browser/sessions/session_types.h"
 
 namespace browser_sync {
 
 SyncedSession::SyncedSession() : session_tag("invalid"),
                                  device_type(TYPE_UNSET) {
 }
 
 SyncedSession::~SyncedSession() {
-  STLDeleteElements(&windows);
+  STLDeleteContainerPairSecondPointers(windows.begin(), windows.end());
 }
 
 }  // namespace browser_sync