(iOS) bugfix: remove openURL delegate that was erroneously re-added b…

…y merge error.

Reimplements dpa99c#731.
Will resolve dpa99c#718.

src/ios/AppDelegate+FirebasePlugin.m

@@ -288,12 +288,6 @@ - (void)application:(UIApplication *)application didFailToRegisterForRemoteNotif
     [FirebasePlugin.firebasePlugin _logError:[NSString stringWithFormat:@"didFailToRegisterForRemoteNotificationsWithError: %@", error.description]];
 }
 
-- (BOOL)application:(nonnull UIApplication *)application
-            openURL:(nonnull NSURL *)url
-            options:(nonnull NSDictionary<NSString *, id> *)options {
-  return [[GIDSignIn sharedInstance] handleURL:url];
-}
-
 - (void)userNotificationCenter:(UNUserNotificationCenter *)center openSettingsForNotification:(UNNotification *)notification
 {
     @try {