[Autofill] Handle the Tab Key in the new UI

content/browser/renderer_host/render_widget_host_impl.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
 #include <queue>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "build/build_config.h"
 #include "content/common/view_message_enums.h"
 #include "content/port/common/input_event_ack_state.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/common/page_zoom.h"
 #include "ipc/ipc_listener.h"
@@ skipping 740 matching lines @@
   // (Similar to |mouse_move_pending_|.) True while waiting for MoveCaret_ACK.
   bool move_caret_pending_;
 
   // (Similar to |next_mouse_move_|.) The next MoveCaret to send, if any.
   scoped_ptr<gfx::Point> next_move_caret_;
 
   // The time when an input event was sent to the RenderWidget.
   base::TimeTicks input_event_start_time_;
 
   // Keyboard event listeners.
-  std::list<KeyboardListener*> keyboard_listeners_;
+  ObserverList<KeyboardListener> keyboard_listeners_;
 
   // If true, then we should repaint when restoring even if we have a
   // backingstore.  This flag is set to true if we receive a paint message
   // while is_hidden_ to true.  Even though we tell the render widget to hide
   // itself, a paint message could already be in flight at that point.
   bool needs_repainting_on_restore_;
 
   // This is true if the renderer is currently unresponsive.
   bool is_unresponsive_;
 
@@ skipping 85 matching lines @@
 
   // List of callbacks for pending snapshot requests to the renderer.
   std::queue<base::Callback<void(bool, const SkBitmap&)> > pending_snapshots_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_