Replace more ObserverList with base::ObserverList.

components/search_provider_logos/logo_tracker.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_SEARCH_PROVIDER_LOGOS_LOGO_TRACKER_H_
 #define COMPONENTS_SEARCH_PROVIDER_LOGOS_LOGO_TRACKER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 191 matching lines @@
   // This will be false if the logo hasn't been read from the cache yet.
   // |cached_logo_| may be NULL even if |is_cached_logo_valid_| is true, if no
   // logo is cached.
   bool is_cached_logo_valid_;
 
   // The URLFetcher currently fetching the logo. NULL when not fetching.
   scoped_ptr<net::URLFetcher> fetcher_;
 
   // The list of observers to be notified when the logo is available. This
   // should be empty when the state is IDLE.
-  ObserverList<LogoObserver> logo_observers_;
+  base::ObserverList<LogoObserver> logo_observers_;
 
   scoped_ptr<LogoDelegate> logo_delegate_;
 
   // The cache used to persist the logo on disk. Used only on the file thread.
   LogoCache* logo_cache_;
 
   // Clock used to determine current time. Can be overridden in tests.
   scoped_ptr<base::Clock> clock_;
 
   // The SequencedTaskRunner on which file system operations will be run.
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
   // The TaskRunner on which the server's response will be parsed.
   scoped_refptr<base::TaskRunner> background_task_runner_;
 
   // The URLRequestContextGetter used for network requests.
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
 
   base::WeakPtrFactory<LogoTracker> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LogoTracker);
 };
 
 }  // namespace search_provider_logos
 
 #endif  // COMPONENTS_SEARCH_PROVIDER_LOGOS_LOGO_TRACKER_H_