Fix the html select tag showing up at the wrong position. This was a regression from r166446.

ui/aura/root_window_host_win.h

Index: ui/aura/root_window_host_win.h
===================================================================
--- ui/aura/root_window_host_win.h	(revision 168290)
+++ ui/aura/root_window_host_win.h	(working copy)
@@ -63,6 +63,7 @@
     MESSAGE_HANDLER_EX(WM_NCACTIVATE, OnNCActivate)
 
     MSG_WM_CLOSE(OnClose)
+    MSG_WM_MOVE(OnMove)
     MSG_WM_PAINT(OnPaint)
     MSG_WM_SIZE(OnSize)
   END_MSG_MAP()
@@ -72,6 +73,7 @@
   LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnCaptureChanged(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnNCActivate(UINT message, WPARAM w_param, LPARAM l_param);
+  void OnMove(const CPoint& point);
   void OnPaint(HDC dc);
   void OnSize(UINT param, const CSize& size);