Remove FlowThreadController and relateds.

Source/core/rendering/RenderBlock.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 1111 matching lines @@
 {
     // It's possible that this block's destruction may have been triggered by the
     // child's removal. Just bail if the anonymous child block is already being
     // destroyed. See crbug.com/282088
     if (child->beingDestroyed())
         return;
     parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
     parent->setChildrenInline(child->childrenInline());
     RenderObject* nextSibling = child->nextSibling();
 
-    RenderFlowThread* childFlowThread = child->flowThreadContainingBlock();
-    CurrentRenderFlowThreadMaintainer flowThreadMaintainer(childFlowThread);
-
     parent->children()->removeChildNode(parent, child, child->hasLayer());
     // FIXME: Get rid of the temporary disabling of continuations. This is needed by the old
     // multicol implementation, because of buggy block continuation handling (which is hard and
     // rather pointless to fix at this point). Support for block continuations can be removed
     // together with the old multicol implementation. crbug.com/408123
     RenderBoxModelObject* temporarilyInactiveContinuation = parent->continuation();
     if (temporarilyInactiveContinuation)
         parent->setContinuation(0);
     child->moveAllChildrenTo(parent, nextSibling, child->hasLayer());
     if (temporarilyInactiveContinuation)
@@ skipping 2773 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink