Make RenderObject::style() return a const object

Source/core/rendering/svg/RenderSVGText.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
  * Copyright (C) 2012 Google Inc.
  *
@@ skipping 49 matching lines @@
     , m_needsTransformUpdate(true)
     , m_needsTextMetricsUpdate(false)
 {
 }
 
 RenderSVGText::~RenderSVGText()
 {
     ASSERT(m_layoutAttributes.isEmpty());
 }
 
-bool RenderSVGText::isChildAllowed(RenderObject* child, RenderStyle*) const
+bool RenderSVGText::isChildAllowed(RenderObject* child, const RenderStyle*) const
 {
     return child->isSVGInline() || (child->isText() && SVGRenderSupport::isRenderableTextNode(child));
 }
 
 RenderSVGText* RenderSVGText::locateRenderSVGTextAncestor(RenderObject* start)
 {
     ASSERT(start);
     while (start && !start->isSVGText())
         start = start->parent();
     if (!start || !start->isSVGText())
@@ skipping 418 matching lines @@
     SVGResourcesCache::clientWillBeRemovedFromTree(child);
 
     Vector<SVGTextLayoutAttributes*, 2> affectedAttributes;
     FontCachePurgePreventer fontCachePurgePreventer;
     subtreeChildWillBeRemoved(child, affectedAttributes);
     RenderSVGBlock::removeChild(child);
     subtreeChildWasRemoved(affectedAttributes);
 }
 
 }