More header cleanup:

chrome/browser/sync/util/extensions_activity_monitor.h

 // Copyright (c) 2009 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 CHROME_BROWSER_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
 #define CHROME_BROWSER_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
 
+#include <map>
+
 #include "base/lock.h"
 #include "base/message_loop.h"
 #include "base/ref_counted.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 namespace browser_sync {
 
 // A class to monitor usage of extensions APIs to send to sync servers, with
 // the ability to purge data once sync servers have acknowledged it (successful
@@ skipping 44 matching lines @@
   Records records_;
   mutable Lock records_lock_;
 
   // Used only from UI loop.
   NotificationRegistrar registrar_;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_