Make RenderObject::style() return a const object

Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "core/rendering/RenderMultiColumnSpannerPlaceholder.h"
 
 namespace blink {
 
 static void copyMarginProperties(RenderStyle* placeholderStyle, const RenderStyle* spannerStyle)
 {
     // We really only need the block direction margins, but there are no setters for that in
     // RenderStyle. Just copy all margin sides. The inline ones don't matter anyway.
     placeholderStyle->setMarginLeft(spannerStyle->marginLeft());
     placeholderStyle->setMarginRight(spannerStyle->marginRight());
     placeholderStyle->setMarginTop(spannerStyle->marginTop());
     placeholderStyle->setMarginBottom(spannerStyle->marginBottom());
 }
 
-RenderMultiColumnSpannerPlaceholder* RenderMultiColumnSpannerPlaceholder::createAnonymous(RenderStyle* parentStyle, RenderBox* rendererInFlowThread)
+RenderMultiColumnSpannerPlaceholder* RenderMultiColumnSpannerPlaceholder::createAnonymous(const RenderStyle* parentStyle, RenderBox* rendererInFlowThread)
 {
     RenderMultiColumnSpannerPlaceholder* newSpanner = new RenderMultiColumnSpannerPlaceholder(rendererInFlowThread);
     Document& document = rendererInFlowThread->document();
     newSpanner->setDocumentForAnonymous(&document);
     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK);
     copyMarginProperties(newStyle.get(), rendererInFlowThread->style());
     newSpanner->setStyle(newStyle);
     return newSpanner;
 }
 
@@ skipping 77 matching lines @@
 {
     return !m_rendererInFlowThread->hasSelfPaintingLayer() && m_rendererInFlowThread->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
 }
 
 const char* RenderMultiColumnSpannerPlaceholder::renderName() const
 {
     return "RenderMultiColumnSpannerPlaceholder";
 }
 
 }