Make PreviousRootInlineBoxCandidatePosition() to ignore nodes without layout object

third_party/WebKit/Source/core/editing/VisibleUnits.h

 /*
  * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 368 matching lines @@
                                                const Position&);
 
 VisiblePositionInFlatTree HonorEditingBoundaryAtOrBefore(
     const VisiblePositionInFlatTree&,
     const PositionInFlatTree&);
 
 Position NextRootInlineBoxCandidatePosition(Node*,
                                             const VisiblePosition&,
                                             EditableType);
 
-Position PreviousRootInlineBoxCandidatePosition(Node*,
-                                                const VisiblePosition&,
-                                                EditableType);
+CORE_EXPORT Position
+PreviousRootInlineBoxCandidatePosition(Node*,
+                                       const VisiblePosition&,
+                                       EditableType);
 
 }  // namespace blink
 
 #endif  // VisibleUnits_h