Make RenderObject::style() return a const object

Source/core/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 95 matching lines @@
     ImageQualityController::remove(this);
 
     // A continuation of this RenderObject should be destroyed at subclasses.
     ASSERT(!continuation());
 
     RenderLayerModelObject::willBeDestroyed();
 }
 
 bool RenderBoxModelObject::calculateHasBoxDecorations() const
 {
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     ASSERT(styleToUse);
     return hasBackground() || styleToUse->hasBorder() || styleToUse->hasAppearance() || styleToUse->boxShadow();
 }
 
 void RenderBoxModelObject::updateFromStyle()
 {
     RenderLayerModelObject::updateFromStyle();
 
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     setHasBoxDecorationBackground(calculateHasBoxDecorations());
     setInline(styleToUse->isDisplayInlineType());
     setPositionState(styleToUse->position());
     setHorizontalWritingMode(styleToUse->isHorizontalWritingMode());
 }
 
 static LayoutSize accumulateInFlowPositionOffsets(const RenderObject* child)
 {
     if (!child->isAnonymousBlock() || !child->isRelPositioned())
         return LayoutSize();
@@ skipping 357 matching lines @@
 }
 
 LayoutRect RenderBoxModelObject::localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset)
 {
     ASSERT(!slowFirstChild());
 
     // FIXME: This does not take into account either :first-line or :first-letter
     // However, as soon as some content is entered, the line boxes will be
     // constructed and this kludge is not called any more. So only the caret size
     // of an empty :first-line'd block is wrong. I think we can live with that.
-    RenderStyle* currentStyle = firstLineStyle();
+    const RenderStyle* currentStyle = firstLineStyle();
 
     enum CaretAlignment { alignLeft, alignRight, alignCenter };
 
     CaretAlignment alignment = alignLeft;
 
     switch (currentStyle->textAlign()) {
     case LEFT:
     case WEBKIT_LEFT:
         break;
     case CENTER:
@@ skipping 141 matching lines @@
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (RenderObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         RenderObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace blink