Make RenderObject::style() return a const object

Source/core/html/shadow/MeterShadowElement.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 61 matching lines @@
 
 bool MeterInnerElement::rendererIsNeeded(const RenderStyle& style)
 {
     if (meterElement()->hasAuthorShadowRoot())
         return HTMLDivElement::rendererIsNeeded(style);
 
     RenderObject* renderer = meterElement()->renderer();
     return renderer && !LayoutTheme::theme().supportsMeter(renderer->style()->appearance()) && HTMLDivElement::rendererIsNeeded(style);
 }
 
-RenderObject* MeterInnerElement::createRenderer(RenderStyle*)
+RenderObject* MeterInnerElement::createRenderer(const RenderStyle*)
 {
     return new RenderMeter(this);
 }
 
 inline MeterBarElement::MeterBarElement(Document& document)
     : MeterShadowElement(document)
 {
 }
 
 PassRefPtrWillBeRawPtr<MeterBarElement> MeterBarElement::create(Document& document)
@@ skipping 37 matching lines @@
         return optimumPseudoId;
     }
 }
 
 void MeterValueElement::setWidthPercentage(double width)
 {
     setInlineStyleProperty(CSSPropertyWidth, width, CSSPrimitiveValue::CSS_PERCENTAGE);
 }
 
 }