Implement :valid and :invalid pseudoclass for <form>

Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 789 matching lines @@
         case CSSSelector::PseudoReadOnly:
             return element.matchesReadOnlyPseudoClass();
         case CSSSelector::PseudoReadWrite:
             return element.matchesReadWritePseudoClass();
         case CSSSelector::PseudoOptional:
             return element.isOptionalFormControl();
         case CSSSelector::PseudoRequired:
             return element.isRequiredFormControl();
         case CSSSelector::PseudoValid:
             element.document().setContainsValidityStyleRules();
-            return element.willValidate() && element.isValidFormControlElement();
+            return element.willValidate() && element.isValidElement();
         case CSSSelector::PseudoInvalid:
             element.document().setContainsValidityStyleRules();
-            return element.willValidate() && !element.isValidFormControlElement();
+            return element.willValidate() && !element.isValidElement();
         case CSSSelector::PseudoChecked:
             {
                 if (isHTMLInputElement(element)) {
                     HTMLInputElement& inputElement = toHTMLInputElement(element);
                     // Even though WinIE allows checked and indeterminate to
                     // co-exist, the CSS selector spec says that you can't be
                     // both checked and indeterminate. We will behave like WinIE
                     // behind the scenes and just obey the CSS spec here in the
                     // test for matching the pseudo.
                     if (inputElement.shouldAppearChecked() && !inputElement.shouldAppearIndeterminate())
@@ skipping 306 matching lines @@
     return isHTMLSelectElement(element) && !toHTMLSelectElement(element).usesMenuList();
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }