Replace more ObserverList with base::ObserverList.

ui/keyboard/keyboard_controller.h

 // Copyright (c) 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_KEYBOARD_KEYBOARD_CONTROLLER_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/event_types.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 163 matching lines @@
 
   scoped_ptr<WindowBoundsChangeObserver> window_bounds_observer_;
 
   ui::InputMethod* input_method_;
   bool keyboard_visible_;
   bool show_on_resize_;
   bool lock_keyboard_;
   KeyboardMode keyboard_mode_;
   ui::TextInputType type_;
 
-  ObserverList<KeyboardControllerObserver> observer_list_;
+  base::ObserverList<KeyboardControllerObserver> observer_list_;
 
   // The currently used keyboard position.
   gfx::Rect current_keyboard_bounds_;
 
   static KeyboardController* instance_;
 
   base::WeakPtrFactory<KeyboardController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_H_