Make RenderObject::style() return a const object

Source/core/rendering/RenderView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 116 matching lines @@
 }
 
 LayoutUnit RenderView::availableLogicalHeight(AvailableLogicalHeightType heightType) const
 {
     // If we have columns, then the available logical height is reduced to the column height.
     if (hasColumns())
         return columnInfo()->columnHeight();
     return RenderBlockFlow::availableLogicalHeight(heightType);
 }
 
-bool RenderView::isChildAllowed(RenderObject* child, RenderStyle*) const
+bool RenderView::isChildAllowed(RenderObject* child, const RenderStyle*) const
 {
     return child->isBox();
 }
 
 void RenderView::layoutContent()
 {
     ASSERT(needsLayout());
 
     RenderBlockFlow::layout();
 
@@ skipping 827 matching lines @@
     return viewWidth(IncludeScrollbars) / scale;
 }
 
 double RenderView::layoutViewportHeight() const
 {
     float scale = m_frameView ? m_frameView->frame().pageZoomFactor() : 1;
     return viewHeight(IncludeScrollbars) / scale;
 }
 
 } // namespace blink