Make VisiblePosition::LastPositionInNode() to take const Node& instead of Node*

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google 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:
@@ skipping 503 matching lines @@
     const String& str = PlainText(
         range,
         TextIteratorBehavior::Builder()
             .SetEmitsObjectReplacementCharacter(HasEditableStyle(*inner_node))
             .Build());
     if (str.IsEmpty() || str.SimplifyWhiteSpace().ContainsOnlyWhitespace())
       return false;
 
     if (new_selection.RootEditableElement() &&
         pos.DeepEquivalent() == VisiblePositionInFlatTree::LastPositionInNode(
-                                    new_selection.RootEditableElement())
+                                    *new_selection.RootEditableElement())
                                     .DeepEquivalent())
       return false;
 
     visibility = HandleVisibility::kVisible;
   }
 
   if (append_trailing_whitespace == AppendTrailingWhitespace::kShouldAppend)
     new_selection.AppendTrailingWhitespace();
 
   return UpdateSelectionForMouseDownDispatchingSelectStart(
@@ skipping 676 matching lines @@
 
 bool IsExtendingSelection(const MouseEventWithHitTestResults& event) {
   bool is_mouse_down_on_link_or_image =
       event.IsOverLink() || event.GetHitTestResult().GetImage();
   return (event.Event().GetModifiers() & WebInputEvent::Modifiers::kShiftKey) !=
              0 &&
          !is_mouse_down_on_link_or_image;
 }
 
 }  // namespace blink