Return null SelectionPaintRange if no LayoutObject.

third_party/WebKit/Source/core/editing/LayoutSelection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 304 matching lines @@
     return SelectionPaintRange();
 
   const PositionInFlatTree start_pos = selection.StartPosition();
   const PositionInFlatTree end_pos = selection.EndPosition();
   DCHECK_LE(start_pos, end_pos);
   LayoutObject* start_layout_object = start_pos.AnchorNode()->GetLayoutObject();
   LayoutObject* end_layout_object = end_pos.AnchorNode()->GetLayoutObject();
   DCHECK(start_layout_object);
   DCHECK(end_layout_object);
   DCHECK(start_layout_object->View() == end_layout_object->View());
+  if (!start_layout_object || !end_layout_object)
+    return SelectionPaintRange();
 
   return SelectionPaintRange(start_layout_object,
                              start_pos.ComputeEditingOffset(),
                              end_layout_object, end_pos.ComputeEditingOffset());
 }
 
 void LayoutSelection::Commit() {
   if (!HasPendingSelection())
     return;
   has_pending_selection_ = false;
@@ skipping 55 matching lines @@
 
     runner->SetShouldInvalidateSelection();
   }
 }
 
 DEFINE_TRACE(LayoutSelection) {
   visitor->Trace(frame_selection_);
 }
 
 }  // namespace blink