Grab mouse capture in the WM_POINTERDOWN message handler in the omnibox.

chrome/browser/ui/views/omnibox/omnibox_view_win.h

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.h
===================================================================
--- chrome/browser/ui/views/omnibox/omnibox_view_win.h	(revision 160963)
+++ chrome/browser/ui/views/omnibox/omnibox_view_win.h	(working copy)
@@ -152,8 +152,7 @@
     MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
     MESSAGE_HANDLER_EX(WM_IME_COMPOSITION, OnImeComposition)
     MESSAGE_HANDLER_EX(WM_IME_NOTIFY, OnImeNotify)
-    MESSAGE_HANDLER_EX(WM_POINTERDOWN, OnPointerDown)
-    MESSAGE_HANDLER_EX(WM_POINTERUP, OnPointerUp)
+    MESSAGE_HANDLER_EX(WM_TOUCH, OnTouchEvent)
     MSG_WM_KEYDOWN(OnKeyDown)
     MSG_WM_KEYUP(OnKeyUp)
     MSG_WM_KILLFOCUS(OnKillFocus)
@@ -251,8 +250,7 @@
   LRESULT OnGetObject(UINT message, WPARAM wparam, LPARAM lparam);
   LRESULT OnImeComposition(UINT message, WPARAM wparam, LPARAM lparam);
   LRESULT OnImeNotify(UINT message, WPARAM wparam, LPARAM lparam);
-  LRESULT OnPointerDown(UINT message, WPARAM wparam, LPARAM lparam);
-  LRESULT OnPointerUp(UINT message, WPARAM wparam, LPARAM lparam);
+  LRESULT OnTouchEvent(UINT message, WPARAM wparam, LPARAM lparam);
   void OnKeyDown(TCHAR key, UINT repeat_count, UINT flags);
   void OnKeyUp(TCHAR key, UINT repeat_count, UINT flags);
   void OnKillFocus(HWND focus_wnd);