[Editing][CodeHealth] Make Node::rootEditableElement static

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 293 matching lines @@
     if (!startContainer || !endContainer)
         return false;
 
     if (!startContainer->hasEditableStyle() || !endContainer->hasEditableStyle())
         return false;
 
     if (range.isCollapsed()) {
         VisiblePosition start = createVisiblePosition(range.startPosition());
         VisiblePosition previous = previousPositionOf(start);
         // FIXME: We sometimes allow deletions at the start of editable roots, like when the caret is in an empty list item.
-        if (previous.isNull() || previous.deepEquivalent().anchorNode()->rootEditableElement() != startContainer->rootEditableElement())
+        if (previous.isNull() || rootEditableElement(*previous.deepEquivalent().anchorNode()) != rootEditableElement(*startContainer))
             return false;
     }
     return true;
 }
 
 bool Editor::smartInsertDeleteEnabled() const
 {
     if (Settings* settings = frame().settings())
         return settings->smartInsertDeleteEnabled();
     return false;
@@ skipping 1098 matching lines @@
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_undoStack);
     visitor->trace(m_mark);
 }
 
 } // namespace blink