Bug 1726393 - Part 2: Rename nsIFormControl::GetFormElement to GetForm; r=smaug

Depends on D122995

Differential Revision: https://phabricator.services.mozilla.com/D122996

dom/html/HTMLFormElement.cpp

@@ -297,7 +297,7 @@ void HTMLFormElement::RequestSubmit(nsGenericHTMLElement* aSubmitter,
 
     // 1.2. If submitter's form owner is not this form element, then throw a
     //      "NotFoundError" DOMException.
-    if (fc->GetFormElement() != this) {
+    if (fc->GetForm() != this) {
       aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
       return;
     }