Remove RenderTheme::supportsDataListUI.

Source/core/rendering/RenderTheme.h

 /*
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 97 matching lines @@
 
     // This method is called whenever a relevant state changes on a particular themed object, e.g., the mouse becomes pressed
     // or a control becomes disabled.
     virtual bool stateChanged(RenderObject*, ControlState) const;
 
     bool shouldDrawDefaultFocusRing(RenderObject*) const;
 
     // A method asking if the theme's controls actually care about redrawing when hovered.
     virtual bool supportsHover(const RenderStyle*) const { return false; }
 
-    // A method asking if the platform is able to show datalist suggestions for a given input type.
-    virtual bool supportsDataListUI(const AtomicString&) const;
-
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
     // A method asking if the platform is able to show a calendar picker for a given input type.
     virtual bool supportsCalendarPicker(const AtomicString&) const;
 #endif
 
     // Text selection colors.
     Color activeSelectionBackgroundColor() const;
     Color inactiveSelectionBackgroundColor() const;
     Color activeSelectionForegroundColor() const;
     Color inactiveSelectionForegroundColor() const;
@@ skipping 184 matching lines @@
     static const RGBA32 defaultTapHighlightColor = 0x66000000;
 
 #if USE(NEW_THEME)
     Theme* m_platformTheme; // The platform-specific theme.
 #endif
 };
 
 } // namespace WebCore
 
 #endif // RenderTheme_h