Implement :valid and :invalid pseudoclass for <form>

Source/core/css/SelectorChecker.cpp

Index: Source/core/css/SelectorChecker.cpp
diff --git a/Source/core/css/SelectorChecker.cpp b/Source/core/css/SelectorChecker.cpp
index 62893d43a92f15282cf479f216de5df939c00bf9..0ce5f8b99c07507a8a1b1512b263ec15bd58897a 100644
--- a/Source/core/css/SelectorChecker.cpp
+++ b/Source/core/css/SelectorChecker.cpp
@@ -809,10 +809,10 @@ bool SelectorChecker::checkOne(const SelectorCheckingContext& context, const Sib
             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)) {