Remove block continuation support.

Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1072 matching lines @@
     return layoutView;
 }
 
 String LayoutObject::decoratedName() const
 {
     StringBuilder name;
     name.append(this->name());
 
     if (isAnonymous())
         name.append(" (anonymous)");
-    if (style()) {
-        if (isAnonymousColumnsBlock())
-            name.append(" (anonymous multi-column)");
-        if (isAnonymousColumnSpanBlock())
-            name.append(" (anonymous multi-column span)");
-    }
     if (isOutOfFlowPositioned())
         name.append(" (positioned)");
     if (isRelPositioned())
         name.append(" (relative positioned)");
     if (isFloating())
         name.append(" (floating)");
 
     return name.toString();
 }
 
@@ skipping 1443 matching lines @@
     }
 
     LayoutObject* destroyRoot = this;
     for (LayoutObject* destroyRootParent = destroyRoot->parent(); destroyRootParent && destroyRootParent->isAnonymous(); destroyRoot = destroyRootParent, destroyRootParent = destroyRootParent->parent()) {
         // Anonymous block continuations are tracked and destroyed elsewhere (see the bottom of LayoutBlock::removeChild)
         if (destroyRootParent->isLayoutBlock() && toLayoutBlock(destroyRootParent)->isAnonymousBlockContinuation())
             break;
         // A flow thread is tracked by its containing block. Whether its children are removed or not is irrelevant.
         if (destroyRootParent->isLayoutFlowThread())
             break;
-        // Column spans are tracked elsewhere.
-        if (destroyRootParent->isAnonymousColumnSpanBlock())
-            break;
 
         if (destroyRootParent->slowFirstChild() != destroyRoot || destroyRootParent->slowLastChild() != destroyRoot)
             break; // Need to keep the anonymous parent, since it won't become empty by the removal of this layoutObject.
     }
 
     destroyRoot->destroy();
 
     // WARNING: |this| is deleted here.
 }
 
@@ skipping 725 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif