Fix autofill popup size

ui/aura/remote_root_window_host_win.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 UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 244 matching lines @@
   // operation is acked by the viewer.
   bool ignore_mouse_moves_until_set_cursor_ack_;
 
   // Tracking last click event for synthetically generated mouse events.
   scoped_ptr<ui::MouseEvent> last_mouse_click_event_;
 
   // State of the keyboard/mouse at the time of the last input event. See
   // description of SetEventFlags().
   uint32 event_flags_;
 
+  // Current size of this root window.
+  gfx::Size window_size_;
+
   DISALLOW_COPY_AND_ASSIGN(RemoteRootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_