Make RenderObject::style() return a const object

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 573 matching lines @@
 
     if (Traversal<HTMLTrackElement>::firstChild(*this))
         scheduleDelayedAction(LoadTextTrackResource);
 }
 
 bool HTMLMediaElement::rendererIsNeeded(const RenderStyle& style)
 {
     return shouldShowControls() && HTMLElement::rendererIsNeeded(style);
 }
 
-RenderObject* HTMLMediaElement::createRenderer(RenderStyle*)
+RenderObject* HTMLMediaElement::createRenderer(const RenderStyle*)
 {
     return new RenderMedia(this);
 }
 
 Node::InsertionNotificationRequest HTMLMediaElement::insertedInto(ContainerNode* insertionPoint)
 {
     WTF_LOG(Media, "HTMLMediaElement::insertedInto(%p, %p)", this, insertionPoint);
 
     HTMLElement::insertedInto(insertionPoint);
     if (insertionPoint->inDocument()) {
@@ skipping 3489 matching lines @@
 
 #if ENABLE(WEB_AUDIO)
 void HTMLMediaElement::clearWeakMembers(Visitor* visitor)
 {
     if (!visitor->isAlive(m_audioSourceNode) && audioSourceProvider())
         audioSourceProvider()->setClient(nullptr);
 }
 #endif
 
 }