migrate ios: remove firebase from example app

Author: davidgovea

examples/mlkit/ios/mlkit/AppDelegate.m

@@ -7,7 +7,6 @@
 
 #import "AppDelegate.h"
 
-#import <Firebase.h>
 #import <React/RCTBundleURLProvider.h>
 #import <React/RCTRootView.h>
 
@@ -17,8 +16,6 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 {
   NSURL *jsCodeLocation;
 
-  [FIRApp configure];
-
   jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
 
   RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation