views: Extract Widget observer into its own header file.

chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc

 // 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.
 
 #include "chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.h"
 
 #include "chrome/browser/ui/omnibox/omnibox_view.h"
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 #include "chrome/browser/ui/views/omnibox/inline_omnibox_popup_view.h"
 #include "chrome/browser/ui/views/omnibox/omnibox_result_view.h"
 #include "chrome/browser/ui/views/omnibox/touch_omnibox_popup_contents_view.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/path.h"
+#include "ui/views/widget/widget.h"
 
 #if defined(OS_WIN)
 #include <dwmapi.h>
 
 #include "base/win/scoped_gdi_object.h"
 #if !defined(USE_AURA)
 #include "ui/views/widget/native_widget_win.h"
 #endif
 #endif
 #if defined(USE_ASH)
@@ skipping 522 matching lines @@
   if (HasMatchAt(index) && should_set_selected_line)
     model_->SetSelectedLine(index, false, false);
 }
 
 void OmniboxPopupContentsView::OpenSelectedLine(
     const views::LocatedEvent& event,
     WindowOpenDisposition disposition) {
   size_t index = GetIndexForPoint(event.location());
   OpenIndex(index, disposition);
 }