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

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 301 matching lines @@
     return selection.isRange() && selection.rootEditableElement();
 }
 
 bool Editor::canDeleteRange(const EphemeralRange& range) const
 {
     Node* startContainer = range.startPosition().computeContainerNode();
     Node* endContainer = range.endPosition().computeContainerNode();
     if (!startContainer || !endContainer)
         return false;
 
-    if (!startContainer->hasEditableStyle() || !endContainer->hasEditableStyle())
+    if (!hasEditableStyle(*startContainer) || !hasEditableStyle(*endContainer))
         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() || rootEditableElement(*previous.deepEquivalent().anchorNode()) != rootEditableElement(*startContainer))
             return false;
     }
     return true;
@@ skipping 1060 matching lines @@
     frame().selection().setShouldShowBlockCursor(m_overwriteModeEnabled);
 }
 
 // TODO(tkent): This is a workaround of some crash bugs in the editing code,
 // which assumes a document has a valid HTML structure. We should make the
 // editing code more robust, and should remove this hack. crbug.com/580941.
 void Editor::tidyUpHTMLStructure(Document& document)
 {
     // hasEditableStyle() needs up-to-date ComputedStyle.
     document.updateStyleAndLayoutTree();
-    bool needsValidStructure = document.hasEditableStyle() || (document.documentElement() && document.documentElement()->hasEditableStyle());
+    bool needsValidStructure = hasEditableStyle(document) || (document.documentElement() && hasEditableStyle(*document.documentElement()));
     if (!needsValidStructure)
         return;
     Element* existingHead = nullptr;
     Element* existingBody = nullptr;
     Element* currentRoot = document.documentElement();
     if (currentRoot) {
         if (isHTMLHtmlElement(currentRoot))
             return;
         if (isHTMLHeadElement(currentRoot))
             existingHead = currentRoot;
@@ skipping 28 matching lines @@
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_undoStack);
     visitor->trace(m_mark);
 }
 
 } // namespace blink