Move IDMap back to base/ where it is needed.

chrome/browser/chrome_plugin_browsing_context.h

 // Copyright (c) 2006-2008 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_CHROME_PLUGIN_BROWSING_CONTEXT_H_
 #define CHROME_BROWSER_CHROME_PLUGIN_BROWSING_CONTEXT_H_
 
 #include <map>
 
+#include "base/id_map.h"
 #include "chrome/common/chrome_plugin_api.h"
-#include "chrome/common/id_map.h"
 #include "chrome/common/notification_registrar.h"
 
 class URLRequestContext;
 
 // This class manages the mapping between CPBrowsingContexts and
 // URLRequestContexts.  It observes when URLRequestContexts go away, and
 // invalidates the corresponding CPBrowsingContexts.  CPBrowsingContexts can be
 // associated with other data as well, so there can be multiple ones referring
 // to a given URLRequestContext.
 // Note: This class should be used on the IO thread only.
@@ skipping 29 matching lines @@
   typedef IDMap<URLRequestContext> Map;
   typedef std::map<URLRequestContext*, CPBrowsingContext> ReverseMap;
 
   NotificationRegistrar registrar_;
 
   Map map_;  // map of CPBrowsingContext -> URLRequestContext
   ReverseMap reverse_map_;  // map of URLRequestContext -> CPBrowsingContext
 };
 
 #endif  // CHROME_BROWSER_CHROME_PLUGIN_BROWSING_CONTEXT_H_