Make RenderObject::style() return a const object

Source/core/layout/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * 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.
@@ skipping 101 matching lines @@
     InlineBidiResolver& m_resolver;
 
     InlineIterator m_current;
     InlineIterator m_lineBreak;
     InlineIterator m_startOfIgnoredSpaces;
 
     RenderBlockFlow* m_block;
     LayoutObject* m_lastObject;
     LayoutObject* m_nextObject;
 
-    LayoutStyle* m_currentStyle;
-    LayoutStyle* m_blockStyle;
+    const LayoutStyle* m_currentStyle;
+    const LayoutStyle* m_blockStyle;
 
     LineInfo& m_lineInfo;
 
     LayoutTextInfo& m_renderTextInfo;
 
     FloatingObject* m_lastFloatFromPreviousLine;
 
     LineWidth m_width;
 
     EWhiteSpace m_currWS;
@@ skipping 757 matching lines @@
 
     if (style.textIndentType() == TextIndentHanging)
         shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
 
     return shouldIndentText;
 }
 
 }
 
 #endif // BreakingContextInlineHeaders_h