Improve omnibox accessibility on Windows.

chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_GTK_OMNIBOX_OMNIBOX_VIEW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_OMNIBOX_OMNIBOX_VIEW_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 102 matching lines @@
                            bool update_popup) OVERRIDE;
 
   virtual void SetWindowTextAndCaretPos(const string16& text,
                                         size_t caret_pos) OVERRIDE;
 
   virtual void SetForcedQuery() OVERRIDE;
 
   virtual bool IsSelectAll() OVERRIDE;
   virtual bool DeleteAtEndPressed() OVERRIDE;
   virtual void GetSelectionBounds(string16::size_type* start,
-                                  string16::size_type* end) OVERRIDE;
+                                  string16::size_type* end) const OVERRIDE;
   virtual void SelectAll(bool reversed) OVERRIDE;
   virtual void RevertAll() OVERRIDE;
 
   virtual void UpdatePopup() OVERRIDE;
   virtual void ClosePopup() OVERRIDE;
 
   virtual void SetFocus() OVERRIDE;
 
   virtual void OnTemporaryTextMaybeChanged(
       const string16& display_text,
@@ skipping 409 matching lines @@
   // The view that is going to be focused next. Only valid while handling
   // "focus-out" events.
   GtkWidget* going_to_focus_;
 
   ui::GtkSignalRegistrar signals_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxViewGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_OMNIBOX_OMNIBOX_VIEW_GTK_H_