Replace more ObserverList with base::ObserverList.

extensions/browser/process_manager.h

 // Copyright 2013 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 EXTENSIONS_BROWSER_PROCESS_MANAGER_H_
 #define EXTENSIONS_BROWSER_PROCESS_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 279 matching lines @@
   BackgroundPageDataMap background_page_data_;
 
   // True if we have created the startup set of background hosts.
   bool startup_background_hosts_created_;
 
   base::Callback<void(content::DevToolsAgentHost*, bool)> devtools_callback_;
 
   ImpulseCallbackForTesting keepalive_impulse_callback_for_testing_;
   ImpulseCallbackForTesting keepalive_impulse_decrement_callback_for_testing_;
 
-  ObserverList<ProcessManagerObserver> observer_list_;
+  base::ObserverList<ProcessManagerObserver> observer_list_;
 
   // ID Counter used to set ProcessManager::BackgroundPageData close_sequence_id
   // members. These IDs are tracked per extension in background_page_data_ and
   // are used to verify that nothing has interrupted the process of closing a
   // lazy background process.
   //
   // Any interruption obtains a new ID by incrementing
   // last_background_close_sequence_id_ and storing it in background_page_data_
   // for a particular extension. Callbacks and round-trip IPC messages store the
   // value of the extension's close_sequence_id at the beginning of the process.
   // Thus comparisons can be done to halt when IDs no longer match.
   //
   // This counter provides unique IDs even when BackgroundPageData objects are
   // reset.
   uint64 last_background_close_sequence_id_;
 
   // Must be last member, see doc on WeakPtrFactory.
   base::WeakPtrFactory<ProcessManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_PROCESS_MANAGER_H_