Bug 1816436 - For webrtcIndicator use dialog everywhere. r=mconley

GTK will no longer draw a border and titlebar with titlebar=no.

Differential Revision: https://phabricator.services.mozilla.com/D169782

browser/modules/webrtcUI.jsm

@@ -1003,12 +1003,7 @@ function getGlobalIndicator() {
   if (!webrtcUI.useLegacyGlobalIndicator) {
     const INDICATOR_CHROME_URI =
       "chrome://browser/content/webrtcIndicator.xhtml";
-    let features = "chrome,titlebar=no,alwaysontop,minimizable=yes";
-
-    /* Don't use dialog on Gtk as it adds extra border and titlebar to indicator */
-    if (!AppConstants.MOZ_WIDGET_GTK) {
-      features += ",dialog=yes";
-    }
+    let features = "chrome,titlebar=no,alwaysontop,minimizable,dialog";
 
     return Services.ww.openWindow(
       null,