Move Singleton and related structs to namespace base

extensions/browser/guest_view/web_view/web_view_renderer_state.h

 // Copyright 2014 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.
 
 // WebViewRendererState manages state data for WebView guest renderer processes.
 //
 // This class's data can be accessed via its methods from both the UI and IO
 // threads, and uses locks to mediate this access. When making changes to this
 // class, ensure that you avoid introducing any reentrant code in the methods,
 // and that you always aquire the locks in the order |web_view_info_map_lock_|
@@ skipping 54 matching lines @@
 
   void AddContentScriptIDs(int embedder_process_id,
                            int view_instance_id,
                            const std::set<int>& script_ids);
   void RemoveContentScriptIDs(int embedder_process_id,
                               int view_instance_id,
                               const std::set<int>& script_ids);
 
  private:
   friend class WebViewGuest;
-  friend struct DefaultSingletonTraits<WebViewRendererState>;
+  friend struct base::DefaultSingletonTraits<WebViewRendererState>;
 
   using RenderId = std::pair<int, int>;
   using WebViewInfoMap = std::map<RenderId, WebViewInfo>;
 
   struct WebViewPartitionInfo {
     int web_view_count;
     std::string partition_id;
     WebViewPartitionInfo() {}
     WebViewPartitionInfo(int count, std::string partition):
       web_view_count(count),
@@ skipping 16 matching lines @@
   mutable base::Lock web_view_info_map_lock_;
   WebViewPartitionIDMap web_view_partition_id_map_;
   mutable base::Lock web_view_partition_id_map_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewRendererState);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_RENDERER_STATE_H_