Simplify form validation handling

Source/core/html/HTMLFormElement.h

Index: Source/core/html/HTMLFormElement.h
diff --git a/Source/core/html/HTMLFormElement.h b/Source/core/html/HTMLFormElement.h
index 8b46c5cade6fcb4356be88c569b88d171c0b268e..0bbd9cd347e38928dc6dab7ed278ea498db938fa 100644
--- a/Source/core/html/HTMLFormElement.h
+++ b/Source/core/html/HTMLFormElement.h
@@ -48,8 +48,6 @@ public:
     virtual ~HTMLFormElement();
     DECLARE_VIRTUAL_TRACE();
 
-    void setNeedsValidityCheck(ValidityRecalcReason, bool isValid);
-
     PassRefPtrWillBeRawPtr<HTMLFormControlsCollection> elements();
     void getNamedElements(const AtomicString&, WillBeHeapVector<RefPtrWillBeMember<Element>>&);
 
@@ -186,10 +184,6 @@ private:
 
     bool m_wasDemoted : 1;
 
-    // Number of invalid elements associated to the form that are candidates
-    // for constraint validation (their willValidate state is true).
-    int m_invalidControlsCount;
-
     OwnPtrWillBeMember<GenericEventQueue> m_pendingAutocompleteEventsQueue;
 };