Bug 1564391 - Rename internal uses of mozInputSource. r=emilio,pip-reviewers,tabbrowser-reviewers,dao,kpatenio

This allows us to deprecate `mozInputSource` for the Web while
avoiding console warnings for internal uses, which now use the
ChromeOnly `inputSource` attribute.

Differential Revision: https://phabricator.services.mozilla.com/D183643

dom/base/Element.cpp

@@ -3209,7 +3209,7 @@ void Element::DispatchChromeOnlyLinkClickEvent(
       /* Cancelable */ true, nsGlobalWindowInner::Cast(doc->GetInnerWindow()),
       0, mouseEvent->CtrlKey(), mouseEvent->AltKey(), mouseEvent->ShiftKey(),
       mouseEvent->MetaKey(), mouseEvent->Button(), mouseDOMEvent,
-      mouseEvent->MozInputSource(), IgnoreErrors());
+      mouseEvent->InputSource(), IgnoreErrors());
   // Note: we're always trusted, but the event we pass as the `sourceEvent`
   // might not be. Frontend code will check that event's trusted property to
   // make that determination; doing it this way means we don't also start