LayoutBlock::removeChild() override no longer needed.

third_party/WebKit/Source/core/layout/LayoutBlock.h

 /*
  * 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 Apple 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 139 matching lines @@
     // |this|. This happens e.g. when there's an anonymous block child of |this| and
     // |beforeDescendant| has been reparented into that one. Such things are invisible to the DOM,
     // and addChild() is typically called with the DOM tree (and not the layout tree) in mind.
     void addChildBeforeDescendant(LayoutObject* newChild, LayoutObject* beforeDescendant);
 
 public:
     // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to LayoutBlockFlow
     virtual void deleteLineBoxTree();
 
     void addChild(LayoutObject* newChild, LayoutObject* beforeChild = nullptr) override;
-    void removeChild(LayoutObject*) override;
 
     virtual void layoutBlock(bool relayoutChildren);
 
     void insertPositionedObject(LayoutBox*);
     static void removePositionedObject(LayoutBox*);
     void removePositionedObjects(LayoutBlock*, ContainingBlockState = SameContainingBlock);
 
     TrackedLayoutBoxListHashSet* positionedObjects() const { return hasPositionedObjects() ? positionedObjectsInternal() : nullptr; }
     bool hasPositionedObjects() const
     {
@@ skipping 327 matching lines @@
     // FIXME: This is temporary as we move code that accesses block flow
     // member variables out of LayoutBlock and into LayoutBlockFlow.
     friend class LayoutBlockFlow;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlock, isLayoutBlock());
 
 } // namespace blink
 
 #endif // LayoutBlock_h