Remove support for anonymous deprecated flexboxes.

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 4672 matching lines @@
     if (isRelPositioned())
         return "RenderBlock (relative positioned)";
     return "RenderBlock";
 }
 
 RenderBlock* RenderBlock::createAnonymousWithParentRendererAndDisplay(const RenderObject* parent, EDisplay display)
 {
     // FIXME: Do we need to convert all our inline displays to block-type in the anonymous logic ?
     EDisplay newDisplay;
     RenderBlock* newBox = 0;
-    if (display == BOX || display == INLINE_BOX) {
-        // FIXME: Remove this case once we have eliminated all internal users of old flexbox
-        newBox = RenderDeprecatedFlexibleBox::createAnonymous(&parent->document());
-        newDisplay = BOX;
-    } else if (display == FLEX || display == INLINE_FLEX) {
+    if (display == FLEX || display == INLINE_FLEX) {
         newBox = RenderFlexibleBox::createAnonymous(&parent->document());
         newDisplay = FLEX;
     } else {
         newBox = RenderBlockFlow::createAnonymous(&parent->document());
         newDisplay = BLOCK;
     }
 
     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), newDisplay);
     newBox->setStyle(newStyle.release());
     return newBox;
@@ skipping 126 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