Cleanup: Only need one bit (not two) to express flow thread state.

Source/core/layout/LayoutBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 578 matching lines @@
     } else {
         LayoutObject* cloneLayoutObject = toElement(node())->createLayoutObject(styleRef());
         cloneBlock = toLayoutBlock(cloneLayoutObject);
         cloneBlock->setStyle(mutableStyle());
 
         // This takes care of setting the right value of childrenInline in case
         // generated content is added to cloneBlock and 'this' does not have
         // generated content added yet.
         cloneBlock->setChildrenInline(cloneBlock->firstChild() ? cloneBlock->firstChild()->isInline() : childrenInline());
     }
-    cloneBlock->setFlowThreadState(flowThreadState());
+    cloneBlock->setIsInsideFlowThread(isInsideFlowThread());
     return cloneBlock;
 }
 
 void LayoutBlock::splitBlocks(LayoutBlock* fromBlock, LayoutBlock* toBlock,
     LayoutBlock* middleBlock,
     LayoutObject* beforeChild, LayoutBoxModelObject* oldCont)
 {
     ASSERT(isDescendantOf(fromBlock));
 
     if (!beforeChild && isAfterContent(lastChild()))
@@ skipping 3310 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink