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

Source/core/svg/SVGAltGlyphItemElement.cpp

 /*
  * Copyright (C) 2011 Leo Yang <leoyang@webkit.org>
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 20 matching lines @@
     : SVGElement(SVGNames::altGlyphItemTag, document)
 {
     ScriptWrappable::init(this);
 }
 
 PassRefPtr<SVGAltGlyphItemElement> SVGAltGlyphItemElement::create(Document& document)
 {
     return adoptRef(new SVGAltGlyphItemElement(document));
 }
 
-bool SVGAltGlyphItemElement::hasValidGlyphElements(Vector<String>& glyphNames) const
+bool SVGAltGlyphItemElement::hasValidGlyphElements(Vector<AtomicString>& glyphNames) const
 {
     // Spec: http://www.w3.org/TR/SVG/text.html#AltGlyphItemElement
     // The ‘altGlyphItem’ element defines a candidate set of possible glyph substitutions.
     // The first ‘altGlyphItem’ element whose referenced glyphs are all available is chosen.
     // Its glyphs are rendered instead of the character(s) that are inside of the referencing
     // ‘altGlyph’ element.
     //
     // Here we fill glyphNames and return true only if all referenced glyphs are valid and
     // there is at least one glyph.
     for (Node* child = firstChild(); child; child = child->nextSibling()) {
         if (child->hasTagName(SVGNames::glyphRefTag)) {
-            String referredGlyphName;
+            AtomicString referredGlyphName;
             if (toSVGGlyphRefElement(child)->hasValidGlyphElement(referredGlyphName))
                 glyphNames.append(referredGlyphName);
             else {
                 glyphNames.clear();
                 return false;
             }
         }
     }
     return !glyphNames.isEmpty();
 }
 
 }
 
 #endif