Replace more ObserverList with base::ObserverList.

content/renderer/render_widget.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 CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 781 matching lines @@
   // These values are used to properly adjust popup position.
   gfx::PointF popup_view_origin_for_emulation_;
   gfx::PointF popup_screen_origin_for_emulation_;
   float popup_origin_scale_for_emulation_;
 
   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;
   scoped_ptr<ResizingModeSelector> resizing_mode_selector_;
 
   // Lists of RenderFrameProxy objects that need to be notified of
   // compositing-related events (e.g. DidCommitCompositorFrame).
-  ObserverList<RenderFrameProxy> render_frame_proxies_;
+  base::ObserverList<RenderFrameProxy> render_frame_proxies_;
 #if defined(VIDEO_HOLE)
-  ObserverList<RenderFrameImpl> video_hole_frames_;
+  base::ObserverList<RenderFrameImpl> video_hole_frames_;
 #endif  // defined(VIDEO_HOLE)
 
   // A list of RenderFrames associated with this RenderWidget. Notifications
   // are sent to each frame in the list for events such as changing
   // visibility state for example.
-  ObserverList<RenderFrameImpl> render_frames_;
+  base::ObserverList<RenderFrameImpl> render_frames_;
 
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_