Replace more ObserverList with base::ObserverList.

ui/app_list/test/app_list_test_view_delegate.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 UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 84 matching lines @@
   AppListTestModel* GetTestModel() { return model_.get(); }
 
  private:
   int dismiss_count_;
   int toggle_speech_recognition_count_;
   int open_search_result_count_;
   int next_profile_app_count_;
   std::map<size_t, int> open_search_result_counts_;
   Users users_;
   scoped_ptr<AppListTestModel> model_;
-  ObserverList<AppListViewDelegateObserver> observers_;
+  base::ObserverList<AppListViewDelegateObserver> observers_;
   SpeechUIModel speech_ui_;
   base::TimeDelta auto_launch_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListTestViewDelegate);
 };
 
 }  // namespace test
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_