Make RenderObject::style() return a const object

Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 1097 matching lines @@
             while (n && n->hasEditableStyle() != startNodeIsEditable)
                 n = NodeTraversal::previousPostOrder(*n, startBlock);
             if (!n || !n->isDescendantOf(highestRoot))
                 break;
         }
         LayoutObject* r = n->renderer();
         if (!r) {
             n = NodeTraversal::previousPostOrder(*n, startBlock);
             continue;
         }
-        LayoutStyle* style = r->style();
-        if (style->visibility() != VISIBLE) {
+        const LayoutStyle& style = r->styleRef();
+        if (style.visibility() != VISIBLE) {
             n = NodeTraversal::previousPostOrder(*n, startBlock);
             continue;
         }
 
         if (r->isBR() || isBlock(n))
             break;
 
         if (r->isText() && toRenderText(r)->renderedTextLength()) {
             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
             type = Position::PositionIsOffsetInAnchor;
-            if (style->preserveNewline()) {
+            if (style.preserveNewline()) {
                 RenderText* text = toRenderText(r);
                 int i = text->textLength();
                 int o = offset;
                 if (n == startNode && o < i)
                     i = max(0, o);
                 while (--i >= 0) {
                     if ((*text)[i] == '\n')
                         return VisiblePosition(Position(toText(n), i + 1), DOWNSTREAM);
                 }
             }
@@ skipping 46 matching lines @@
                 n = NodeTraversal::next(*n, stayInsideBlock);
             if (!n || !n->isDescendantOf(highestRoot))
                 break;
         }
 
         LayoutObject* r = n->renderer();
         if (!r) {
             n = NodeTraversal::next(*n, stayInsideBlock);
             continue;
         }
-        LayoutStyle* style = r->style();
-        if (style->visibility() != VISIBLE) {
+        const LayoutStyle& style = r->styleRef();
+        if (style.visibility() != VISIBLE) {
             n = NodeTraversal::next(*n, stayInsideBlock);
             continue;
         }
 
         if (r->isBR() || isBlock(n))
             break;
 
         // FIXME: We avoid returning a position where the renderer can't accept the caret.
         if (r->isText() && toRenderText(r)->renderedTextLength()) {
             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
             int length = toRenderText(r)->textLength();
             type = Position::PositionIsOffsetInAnchor;
-            if (style->preserveNewline()) {
+            if (style.preserveNewline()) {
                 RenderText* text = toRenderText(r);
                 int o = n == startNode ? offset : 0;
                 for (int i = o; i < length; ++i) {
                     if ((*text)[i] == '\n')
                         return VisiblePosition(Position(toText(n), i), DOWNSTREAM);
                 }
             }
             node = n;
             offset = r->caretMaxOffset();
             n = NodeTraversal::next(*n, stayInsideBlock);
@@ skipping 184 matching lines @@
     int caretOffset;
     position.position().getInlineBoxAndOffset(position.affinity(), inlineBox, caretOffset);
 
     if (inlineBox)
         renderer = &inlineBox->renderer();
 
     return renderer->localCaretRect(inlineBox, caretOffset);
 }
 
 }