revert change to app delegate that wont build on earlier xcodes (#5702)

Jonah Williams · web-flow · commit d5fce84be8af · 2018-07-09T15:22:25.000-07:00
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm b/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm
@@ -129,7 +129,7 @@ - (void)application:(UIApplication*)application
 
 - (BOOL)application:(UIApplication*)application
     continueUserActivity:(NSUserActivity*)userActivity
-      restorationHandler:(void (^)(NSArray<id<UIUserActivityRestoring>>*))restorationHandler {
+      restorationHandler:(void (^)(NSArray*))restorationHandler {
   return [_lifeCycleDelegate application:application
                     continueUserActivity:userActivity
                       restorationHandler:restorationHandler];
