Revert of 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 06b1ca0d4fe78f24c868871070f45650f5579ae4..954192c9b742debb79e72c6062c61ea3efa741a9 100644
--- a/Source/core/css/SelectorChecker.cpp
+++ b/Source/core/css/SelectorChecker.cpp
@@ -807,10 +807,10 @@
             return element.isRequiredFormControl();
         case CSSSelector::PseudoValid:
             element.document().setContainsValidityStyleRules();
-            return element.willValidate() && element.isValidElement();
+            return element.willValidate() && element.isValidFormControlElement();
         case CSSSelector::PseudoInvalid:
             element.document().setContainsValidityStyleRules();
-            return element.willValidate() && !element.isValidElement();
+            return element.willValidate() && !element.isValidFormControlElement();
         case CSSSelector::PseudoChecked:
             {
                 if (isHTMLInputElement(element)) {