Revert of Implement :valid and :invalid pseudoclass for <form>

Source/core/css/resolver/SharedStyleFinder.cpp

Index: Source/core/css/resolver/SharedStyleFinder.cpp
diff --git a/Source/core/css/resolver/SharedStyleFinder.cpp b/Source/core/css/resolver/SharedStyleFinder.cpp
index 2e37f8c28edca916ecb29c0898801b01b8aabfca..ce16c0df1f0d4b7ef17a08556a3e785caf1906c7 100644
--- a/Source/core/css/resolver/SharedStyleFinder.cpp
+++ b/Source/core/css/resolver/SharedStyleFinder.cpp
@@ -84,7 +84,7 @@
         if (willValidate != element().willValidate())
             return false;
 
-        if (willValidate && (candidate.isValidElement() != element().isValidElement()))
+        if (willValidate && (candidate.isValidFormControlElement() != element().isValidFormControlElement()))
             return false;
 
         if (candidate.isInRange() != element().isInRange())
@@ -262,11 +262,6 @@
         if (parent->hasID() && m_features.hasSelectorForId(parent->idForStyleResolution()))
             return false;
         if (!parent->childrenSupportStyleSharing())
-            return false;
-    }
-
-    if (document().containsValidityStyleRules()) {
-        if (candidate.isValidElement() != element().isValidElement())
             return false;
     }