Avoid markDirty when removing out-of-flow line boxes.

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 691 matching lines @@
         if (r->m_object->isOutOfFlowPositioned())
             r->m_box->setLogicalTop(logicalHeight().toFloat());
 
         // Position is used to properly position both replaced elements and
         // to update the static normal flow x/y of positioned elements.
         if (r->m_object->isText())
             toRenderText(r->m_object)->positionLineBox(r->m_box);
         else if (r->m_object->isBox())
             toRenderBox(r->m_object)->positionLineBox(r->m_box);
     }
-    // Positioned objects and zero-length text nodes destroy their boxes in
-    // position(), which unnecessarily dirties the line.
-    lineBox->markDirty(false);
 }
 
 void RenderBlockFlow::appendFloatingObjectToLastLine(FloatingObject* floatingObject)
 {
     ASSERT(!floatingObject->originatingLine());
     floatingObject->setOriginatingLine(lastRootBox());
     lastRootBox()->appendFloat(floatingObject->renderer());
 }
 
 // FIXME: This should be a BidiStatus constructor or create method.
@@ skipping 1471 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;
 }
 
 }