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)
@@ -150,8 +150,10 @@
     MSG_WM_CREATE(OnCreate)
     MSG_WM_CUT(OnCut)
     MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
+    MSG_WM_DESTROY(OnDestroy)
     MESSAGE_HANDLER_EX(WM_IME_COMPOSITION, OnImeComposition)
     MESSAGE_HANDLER_EX(WM_IME_NOTIFY, OnImeNotify)
+    MESSAGE_HANDLER_EX(WM_TOUCH, OnTouchEvent)
     MESSAGE_HANDLER_EX(WM_POINTERDOWN, OnPointerDown)
     MESSAGE_HANDLER_EX(WM_POINTERUP, OnPointerUp)
     MSG_WM_KEYDOWN(OnKeyDown)
@@ -249,8 +251,10 @@
   LRESULT OnCreate(const CREATESTRUCTW* create_struct);
   void OnCut();
   LRESULT OnGetObject(UINT message, WPARAM wparam, LPARAM lparam);
+  void OnDestroy();
   LRESULT OnImeComposition(UINT message, WPARAM wparam, LPARAM lparam);
   LRESULT OnImeNotify(UINT message, WPARAM wparam, LPARAM lparam);
+  LRESULT OnTouchEvent(UINT message, WPARAM wparam, LPARAM lparam);
   LRESULT OnPointerDown(UINT message, WPARAM wparam, LPARAM lparam);
   LRESULT OnPointerUp(UINT message, WPARAM wparam, LPARAM lparam);
   void OnKeyDown(TCHAR key, UINT repeat_count, UINT flags);