Introduce use counters for Blink specific editing event usage

Source/core/html/HTMLTextFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 596 matching lines @@
             getNextSoftBreak(line, breakNode, breakOffset);
     }
     return finishText(result);
 }
 
 HTMLTextFormControlElement* enclosingTextFormControl(const Position& position)
 {
     ASSERT(position.isNull() || position.anchorType() == Position::PositionIsOffsetInAnchor
         || position.containerNode() || !position.anchorNode()->shadowHost()
         || (position.anchorNode()->parentNode() && position.anchorNode()->parentNode()->isShadowRoot()));
+    return enclosingTextFormControl(position.containerNode());
+}
 
-    Node* container = position.containerNode();
+HTMLTextFormControlElement* enclosingTextFormControl(Node* container)
+{
     if (!container)
         return 0;
     Element* ancestor = container->shadowHost();
     return ancestor && isHTMLTextFormControlElement(*ancestor) && container->containingShadowRoot()->type() == ShadowRoot::UserAgentShadowRoot ? toHTMLTextFormControlElement(ancestor) : 0;
 }
 
 static const HTMLElement* parentHTMLElement(const Element* element)
 {
     while (element) {
         element = element->parentElement();
@@ skipping 22 matching lines @@
 
     return "ltr";
 }
 
 HTMLElement* HTMLTextFormControlElement::innerTextElement() const
 {
     return toHTMLElement(userAgentShadowRoot()->getElementById(ShadowElementNames::innerEditor()));
 }
 
 } // namespace Webcore