Use C++11 features in core/html

Source/core/html/HTMLKeygenElement.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, 2010 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 50 matching lines @@
     DEFINE_STATIC_LOCAL(AtomicString, keygenSelectPseudoId, ("-webkit-keygen-select", AtomicString::ConstructFromLiteral));
 
     Vector<String> keys;
     keys.reserveCapacity(2);
     keys.append(locale().queryString(WebLocalizedString::KeygenMenuHighGradeKeySize));
     keys.append(locale().queryString(WebLocalizedString::KeygenMenuMediumGradeKeySize));
 
     // Create a select element with one option element for each key size.
     RefPtrWillBeRawPtr<HTMLSelectElement> select = HTMLSelectElement::create(document());
     select->setShadowPseudoId(keygenSelectPseudoId);
-    for (size_t i = 0; i < keys.size(); ++i) {
+    for (const String& key : keys) {
         RefPtrWillBeRawPtr<HTMLOptionElement> option = HTMLOptionElement::create(document());
-        option->appendChild(Text::create(document(), keys[i]));
+        option->appendChild(Text::create(document(), key));
         select->appendChild(option);
     }
 
     root.appendChild(select);
 }
 
 void HTMLKeygenElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     // Reflect disabled attribute on the shadow select element
     if (name == disabledAttr)
@@ skipping 36 matching lines @@
 {
     return true;
 }
 
 bool HTMLKeygenElement::supportsAutofocus() const
 {
     return true;
 }
 
 } // namespace