[CRD iOS] Refactor an interface for RemotingAuthorization

remoting/ios/app/app_view_controller.h

Index: remoting/ios/app/app_view_controller.h
diff --git a/remoting/ios/app/app_view_controller.h b/remoting/ios/app/app_view_controller.h
index efc5edc440a79db130b3e2588a088e6d366e8fde..95870748abd0b89bc0e61ca6a62f74b83e08e0c1 100644
--- a/remoting/ios/app/app_view_controller.h
+++ b/remoting/ios/app/app_view_controller.h
@@ -7,6 +7,8 @@
 
 #import <UIKit/UIKit.h>
 
+@protocol RemotingAuthentication;
+
 @protocol AppController<NSObject>
 
 // For adding new methods, please mark them as optional until they are
@@ -17,6 +19,9 @@
 - (void)hideMenuAnimated:(BOOL)animated;
 - (void)presentSignInFlow;
 
+@property(nonatomic, readonly) id<RemotingAuthentication> authentication;
+@property(nonatomic) UIViewController* mainViewController;
+
 @end
 
 // The root view controller of the app. It acts as a container controller for
@@ -25,9 +30,6 @@
 // and feedback.
 @interface AppViewController : UIViewController<AppController>
 
-- (instancetype)initWithMainViewController:
-    (UIViewController*)mainViewController;
-
 @end
 
 #endif  // REMOTING_IOS_APP_APP_VIEW_CONTROLLER_H_