Empty LayoutObject::pushMappingToContainer(). Assert that not reached.

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 2044 matching lines @@
     transformState.move(o->columnOffset(roundedLayoutPoint(transformState.mappedPoint())));
 
     if (o->hasOverflowClip())
         transformState.move(-toLayoutBox(o)->scrolledContentOffset());
 
     o->mapLocalToContainer(paintInvalidationContainer, transformState, mode, wasFixed, paintInvalidationState);
 }
 
 const LayoutObject* LayoutObject::pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap& geometryMap) const
 {
-    ASSERT_UNUSED(ancestorToStopAt, ancestorToStopAt != this);
-
-    LayoutObject* container = parent();
-    if (!container)
-        return nullptr;
-
-    // FIXME: this should call offsetFromContainer to share code, but I'm not sure it's ever called.
-    LayoutSize offset;
-    if (container->hasOverflowClip())
-        offset = -LayoutSize(toLayoutBox(container)->scrolledContentOffset());
-
-    geometryMap.push(this, offset);
-
-    return container;
+    ASSERT_NOT_REACHED();
+    return nullptr;
 }
 
 void LayoutObject::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
 {
     LayoutObject* o = parent();
     if (o) {
         o->mapAbsoluteToLocalPoint(mode, transformState);
         if (o->hasOverflowClip())
             transformState.move(toLayoutBox(o)->scrolledContentOffset());
     }
@@ skipping 1181 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