add 'slow' prefix to RenderObject's firstChild() / lastChild() methods

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * 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.
  *
  * 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 46 matching lines @@
             if (current != root)
                 current = 0;
             else
                 current = next;
             break;
         }
         current = current->parent();
     }
 
     if (!current)
-        current = root->firstChild();
+        current = root->slowFirstChild();
 
     while (current) {
         next = 0;
         if (isIteratorTarget(current) && !(current->isText() && toRenderText(current)->isAllCollapsibleWhitespace()))
             break;
 
         if (!isIteratorTarget(current) && !isIsolated(current->style()->unicodeBidi()))
-            next = current->firstChild();
+            next = current->slowFirstChild();
 
         if (!next) {
             while (current && current != root) {
                 next = current->nextSibling();
                 if (next)
                     break;
                 current = current->parent();
             }
         }
 
@@ skipping 506 matching lines @@
 
 void RenderBlockFlow::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, const LineInfo& lineInfo, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd,
                                                          GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
 {
     ETextAlign textAlign = textAlignmentForLine(!reachedEnd && !lineBox->endsWithBreak());
 
     // CSS 2.1: "'Text-indent' only affects a line if it is the first formatted line of an element. For example, the first line of an anonymous block
     // box is only affected if it is the first child of its parent element."
     // CSS3 "text-indent", "each-line" affects the first line of the block container as well as each line after a forced line break,
     // but does not affect lines after a soft wrap break.
-    bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->firstChild() != this);
+    bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->slowFirstChild() != this);
     bool isAfterHardLineBreak = lineBox->prevRootBox() && lineBox->prevRootBox()->endsWithBreak();
     IndentTextOrNot shouldIndentText = requiresIndent(isFirstLine, isAfterHardLineBreak, style());
     float lineLogicalLeft;
     float lineLogicalRight;
     float availableLogicalWidth;
     updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, 0);
     bool needsWordSpacing;
 
     if (firstRun && firstRun->m_object->isReplaced()) {
         RenderBox* renderBox = toRenderBox(firstRun->m_object);
@@ skipping 641 matching lines @@
     RenderObject* next();
 };
 
 RenderObject* InlineMinMaxIterator::next()
 {
     RenderObject* result = 0;
     bool oldEndOfInline = endOfInline;
     endOfInline = false;
     while (current || current == parent) {
         if (!oldEndOfInline && (current == parent || (!current->isFloating() && !current->isReplaced() && !current->isOutOfFlowPositioned())))
-            result = current->firstChild();
+            result = current->slowFirstChild();
 
         if (!result) {
             // We hit the end of our inline. (It was empty, e.g., <span></span>.)
             if (!oldEndOfInline && current->isRenderInline()) {
                 result = current;
                 endOfInline = true;
                 break;
             }
 
             while (current && current != parent) {
@@ skipping 918 matching lines @@
     float logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false).toFloat();
     float availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
 }