[CRD iOS] Refactor an interface for RemotingAuthorization

remoting/ios/app/app_delegate.mm

Index: remoting/ios/app/app_delegate.mm
diff --git a/remoting/ios/app/app_delegate.mm b/remoting/ios/app/app_delegate.mm
index 50a7597cc81d116f771850da072ba007c50ce668..9a9abec72f1db60d50aad1e96c9e4b6f8000be5f 100644
--- a/remoting/ios/app/app_delegate.mm
+++ b/remoting/ios/app/app_delegate.mm
@@ -14,8 +14,7 @@
 
 #import "remoting/ios/app/app_view_controller.h"
 #import "remoting/ios/app/remoting_view_controller.h"
-#import "remoting/ios/facade/remoting_authentication.h"
-#import "remoting/ios/facade/remoting_service.h"
+#import "remoting/ios/facade/remoting_oauth_authentication.h"
 
 @interface AppDelegate () {
   AppViewController* _appViewController;
@@ -40,7 +39,11 @@
   return YES;
 }
 
+#ifndef NDEBUG
 - (BOOL)application:(UIApplication*)application handleOpenURL:(NSURL*)url {
+  DCHECK([RemotingService.instance.authentication
+      isKindOfClass:[RemotingOAuthAuthentication class]]);
+
   NSMutableDictionary* components = [[NSMutableDictionary alloc] init];
   NSArray* urlComponents = [[url query] componentsSeparatedByString:@"&"];
 
@@ -52,12 +55,13 @@
   }
   NSString* authorizationCode = [components objectForKey:@"code"];
 
-  [[RemotingService SharedInstance].authentication
+  [(RemotingOAuthAuthentication*)RemotingService.instance.authentication
       authenticateWithAuthorizationCode:authorizationCode];
 
   [self launchRemotingViewController];
   return YES;
 }
+#endif  // ifndef NDEBUG
 
 #pragma mark - Public
 - (void)showMenuAnimated:(BOOL)animated {
@@ -88,7 +92,6 @@
   UINavigationController* navController =
       [[UINavigationController alloc] initWithRootViewController:vc];
   navController.navigationBarHidden = true;
-
   _appViewController =
       [[AppViewController alloc] initWithMainViewController:navController];
   self.window.rootViewController = _appViewController;