Bug 1740230 - Remove some prefs for pseudo-classes that we have shipped/unshipped successfully. r=dholbert

And remove code for :-moz-submit-invalid completely.

Differential Revision: https://phabricator.services.mozilla.com/D130737

dom/html/HTMLFormElement.h

@@ -224,8 +224,8 @@ class HTMLFormElement final : public nsGenericHTMLElement,
   void OnSubmitClickEnd();
 
   /**
-   * This method will update the form validity so the submit controls states
-   * will be updated (for -moz-submit-invalid pseudo-class).
+   * This method will update the form validity.
+   *
    * This method has to be called by form elements whenever their validity state
    * or status regarding constraint validation changes.
    *
@@ -237,16 +237,6 @@ class HTMLFormElement final : public nsGenericHTMLElement,
    */
   void UpdateValidity(bool aElementValidityState);
 
-  /**
-   * Returns the form validity based on the last UpdateValidity() call.
-   *
-   * @return Whether the form was valid the last time UpdateValidity() was
-   * called.
-   *
-   * @note This method may not return the *current* validity state!
-   */
-  bool GetValidity() const { return !mInvalidElementsCount; }
-
   /**
    * This method check the form validity and make invalid form elements send
    * invalid event if needed.
@@ -594,7 +584,6 @@ class HTMLFormElement final : public nsGenericHTMLElement,
   /**
    * Number of invalid and candidate for constraint validation elements in the
    * form the last time UpdateValidity has been called.
-   * @note Should only be used by UpdateValidity() and GetValidity()!
    */
   int32_t mInvalidElementsCount;