Replace more ObserverList with base::ObserverList.

storage/browser/database/database_tracker.h

 // Copyright (c) 2012 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 STORAGE_BROWSER_DATABASE_DATABASE_TRACKER_H_
 #define STORAGE_BROWSER_DATABASE_DATABASE_TRACKER_H_
 
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 263 matching lines @@
 
   bool is_initialized_;
   const bool is_incognito_;
   bool force_keep_session_state_;
   bool shutting_down_;
   const base::FilePath profile_path_;
   const base::FilePath db_dir_;
   scoped_ptr<sql::Connection> db_;
   scoped_ptr<DatabasesTable> databases_table_;
   scoped_ptr<sql::MetaTable> meta_table_;
-  ObserverList<Observer, true> observers_;
+  base::ObserverList<Observer, true> observers_;
   std::map<std::string, CachedOriginInfo> origins_info_map_;
   DatabaseConnections database_connections_;
 
   // The set of databases that should be deleted but are still opened
   DatabaseSet dbs_to_be_deleted_;
   PendingDeletionCallbacks deletion_callbacks_;
 
   // Apps and Extensions can have special rights.
   scoped_refptr<storage::SpecialStoragePolicy> special_storage_policy_;
 
@@ skipping 15 matching lines @@
   // this map to assign directory names that do not reveal this information.
   OriginDirectoriesMap incognito_origin_directories_;
   int incognito_origin_directories_generator_;
 
   FRIEND_TEST_ALL_PREFIXES(DatabaseTracker, TestHelper);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_DATABASE_DATABASE_TRACKER_H_