Make calls to AtomicString(const String&) explicit in html/

Source/core/html/HTMLOutputElement.cpp

 /*
  * Copyright (c) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 57 matching lines @@
         setFor(value);
     else
         HTMLFormControlElement::parseAttribute(name, value);
 }
 
 DOMSettableTokenList* HTMLOutputElement::htmlFor() const
 {
     return m_tokens.get();
 }
 
-void HTMLOutputElement::setFor(const String& value)
+void HTMLOutputElement::setFor(const AtomicString& value)
 {
     m_tokens->setValue(value);
 }
 
 void HTMLOutputElement::childrenChanged(bool createdByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     HTMLFormControlElement::childrenChanged(createdByParser, beforeChange, afterChange, childCountDelta);
 
     if (createdByParser || m_isSetTextContentInProgress) {
         m_isSetTextContentInProgress = false;
@@ skipping 46 matching lines @@
 }
 
 void HTMLOutputElement::setTextContentInternal(const String& value)
 {
     ASSERT(!m_isSetTextContentInProgress);
     m_isSetTextContentInProgress = true;
     setTextContent(value);
 }
 
 } // namespace