[Editing][DOM][CodeHealth] Make Node::hasEditableStyle global functions.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/editing/EditingStrategy.h"
 
 #include "core/editing/EditingUtilities.h"
 #include "core/layout/LayoutObject.h"
 
 namespace blink {
@@ skipping 15 matching lines @@
 
 template <typename Traversal>
 bool EditingAlgorithm<Traversal>::isEmptyNonEditableNodeInEditable(const Node* node)
 {
     // Editability is defined the DOM tree rather than the flat tree. For example:
     // DOM:
     //   <host><span>unedittable</span><shadowroot><div ce><content /></div></shadowroot></host>
     // Flat Tree:
     //   <host><div ce><span1>unedittable</span></div></host>
     // e.g. editing/shadow/breaking-editing-boundaries.html
-    return !Traversal::hasChildren(*node) && !node->hasEditableStyle() && node->parentNode() && node->parentNode()->hasEditableStyle();
+    return !Traversal::hasChildren(*node) && !hasEditableStyle(*node) && node->parentNode() && hasEditableStyle(*node->parentNode());
 }
 
 template <typename Traversal>
 bool EditingAlgorithm<Traversal>::editingIgnoresContent(const Node* node)
 {
     return !node->canContainRangeEndPoint() || isEmptyNonEditableNodeInEditable(node);
 }
 
 template <typename Traversal>
 int EditingAlgorithm<Traversal>::lastOffsetForEditing(const Node* node)
@@ skipping 39 matching lines @@
         candidateRoot = parent;
         parent = Strategy::parent(*candidateRoot);
     }
     return candidateRoot;
 }
 
 template class CORE_TEMPLATE_EXPORT EditingAlgorithm<NodeTraversal>;
 template class CORE_TEMPLATE_EXPORT EditingAlgorithm<FlatTreeTraversal>;
 
 } // namespace blink