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

third_party/WebKit/Source/core/editing/commands/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 Apple 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 745 matching lines @@
 
     // FIXME: Callers should perform this operation on a Range that includes the br
     // if they want style applied to the empty line.
     if (start == end && isHTMLBRElement(*start.anchorNode()))
         pastEndNode = NodeTraversal::next(*start.anchorNode());
 
     // Start from the highest fully selected ancestor so that we can modify the fully selected node.
     // e.g. When applying font-size: large on <font color="blue">hello</font>, we need to include the font element in our run
     // to generate <font color="blue" size="4">hello</font> instead of <font color="blue"><font size="4">hello</font></font>
     Range* range = Range::create(startNode->document(), start, end);
-    Element* editableRoot = startNode->rootEditableElement();
+    Element* editableRoot = rootEditableElement(*startNode);
     if (startNode != editableRoot) {
         while (editableRoot && startNode->parentNode() != editableRoot && isNodeVisiblyContainedWithin(*startNode->parentNode(), *range))
             startNode = startNode->parentNode();
     }
 
     applyInlineStyleToNodeRange(style, startNode, pastEndNode, editingState);
 }
 
 static bool containsNonEditableRegion(Node& node)
 {
@@ skipping 949 matching lines @@
 DEFINE_TRACE(ApplyStyleCommand)
 {
     visitor->trace(m_style);
     visitor->trace(m_start);
     visitor->trace(m_end);
     visitor->trace(m_styledInlineElement);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink