Make RenderObject::style() return a const object

Source/core/rendering/RenderPagedFlowThread.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/RenderPagedFlowThread.h"
 
 namespace blink {
 
-RenderPagedFlowThread* RenderPagedFlowThread::createAnonymous(Document& document, RenderStyle* parentStyle)
+RenderPagedFlowThread* RenderPagedFlowThread::createAnonymous(Document& document, const RenderStyle* parentStyle)
 {
     RenderPagedFlowThread* renderer = new RenderPagedFlowThread();
     renderer->setDocumentForAnonymous(&document);
     renderer->setStyle(RenderStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK));
     return renderer;
 }
 
 const char* RenderPagedFlowThread::renderName() const
 {
     return "RenderPagedFlowThread";
@@ skipping 12 matching lines @@
     RenderFlowThread::updateLogicalWidth();
 }
 
 void RenderPagedFlowThread::layout()
 {
     setProgressionIsInline(pagedBlockFlow()->style()->hasInlinePaginationAxis());
     RenderMultiColumnFlowThread::layout();
 }
 
 } // namespace blink