Replace more ObserverList with base::ObserverList.

components/enhanced_bookmarks/enhanced_bookmark_model.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.
 
 #ifndef COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 184 matching lines @@
 
   // Helper method for setting multiple meta info fields at once. All the fields
   // in |meta_info| will be set, but the method will not delete fields not
   // present.
   void SetMultipleMetaInfo(const bookmarks::BookmarkNode* node,
                            bookmarks::BookmarkNode::MetaInfoMap meta_info);
 
   bookmarks::BookmarkModel* bookmark_model_;
   bool loaded_;
 
-  ObserverList<EnhancedBookmarkModelObserver> observers_;
+  base::ObserverList<EnhancedBookmarkModelObserver> observers_;
 
   IdToNodeMap id_map_;
   NodeToIdMap nodes_to_reset_;
 
   // Caches the remote id of a node before its meta info changes.
   std::string prev_remote_id_;
 
   std::string version_;
   std::string version_suffix_;
 
   base::WeakPtrFactory<EnhancedBookmarkModel> weak_ptr_factory_;
 };
 
 }  // namespace enhanced_bookmarks
 
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_