Bug 1823340 - Make toolkit/components/alerts buildable outside of a unified build environment r=andi

Depends on D172967

Differential Revision: https://phabricator.services.mozilla.com/D172968

toolkit/components/alerts/moz.build

@@ -43,5 +43,3 @@ JAR_MANIFESTS += ["jar.mn"]
 
 with Files("**"):
     BUG_COMPONENT = ("Toolkit", "Notifications and Alerts")
-
-REQUIRES_UNIFIED_BUILD = True

toolkit/components/alerts/nsAlertsService.cpp

@@ -15,6 +15,7 @@
 #include "nsXPCOM.h"
 #include "nsPromiseFlatString.h"
 #include "nsToolkitCompsCID.h"
+#include "nsComponentManagerUtils.h"
 
 #ifdef MOZ_PLACES
 #  include "nsIFaviconService.h"

toolkit/components/alerts/nsXULAlerts.h

@@ -11,6 +11,7 @@
 #include "nsInterfaceHashtable.h"
 
 #include "mozIDOMWindow.h"
+#include "nsIAlertsService.h"
 #include "nsIObserver.h"
 
 struct PendingAlert {