Revert of Separate repaint and layout requirements of StyleDifference (Step 1)

Source/core/rendering/RenderText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 175 matching lines @@
 {
     return false;
 }
 
 void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     // There is no need to ever schedule repaints from a style change of a text run, since
     // we already did this for the parent of the text run.
     // We do have to schedule layouts, though, since a style change can force us to
     // need to relayout.
-    if (diff.needsFullLayout()) {
+    if (diff == StyleDifferenceLayout) {
         setNeedsLayoutAndPrefWidthsRecalc();
         m_knownToHaveNoOverflowAndNoFallbackFonts = false;
     }
 
     RenderStyle* newStyle = style();
     ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE;
     ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE;
     if (oldTransform != newStyle->textTransform() || oldSecurity != newStyle->textSecurity())
         transformText();
 
@@ skipping 1656 matching lines @@
     }
     secureTextTimer->restartWithNewText(lastTypedCharacterOffset);
 }
 
 PassRefPtr<AbstractInlineTextBox> RenderText::firstAbstractInlineTextBox()
 {
     return AbstractInlineTextBox::getOrCreate(this, m_firstTextBox);
 }
 
 } // namespace WebCore