[CRD iOS] Refactor an interface for RemotingAuthorization

remoting/ios/facade/remoting_service.h

Index: remoting/ios/facade/remoting_service.h
diff --git a/remoting/ios/facade/remoting_service.h b/remoting/ios/facade/remoting_service.h
index 33f9fd999104acfa3a6d701e00a973b3989038b2..e93f5193772c7e3394b2d312b8adbb3c33fa2b18 100644
--- a/remoting/ios/facade/remoting_service.h
+++ b/remoting/ios/facade/remoting_service.h
@@ -7,12 +7,10 @@
 
 #import "remoting/client/chromoting_client_runtime.h"
 
-#include "base/memory/weak_ptr.h"
-#include "remoting/base/oauth_token_getter.h"
-
 @class HostInfo;
 @class UserInfo;
-@class RemotingAuthentication;
+
+@protocol RemotingAuthentication;
 
 // Eventing related keys:
 
@@ -36,8 +34,6 @@ extern NSString* const kUserInfo;
 // |kHostsDidUpdate| when a new host is ready.
 - (void)requestHostListFetch;
 
-@property(nonatomic, readonly) RemotingAuthentication* authentication;
-
 // Returns the current host list.
 @property(nonatomic, readonly) NSArray<HostInfo*>* hosts;
 
@@ -45,6 +41,10 @@ extern NSString* const kUserInfo;
 // resources used by the Chromoting clients
 @property(nonatomic, readonly) remoting::ChromotingClientRuntime* runtime;
 
+// This must be set immediately after the authentication object is created. It
+// can only be set once.
+@property(nonatomic) id<RemotingAuthentication> authentication;
+
 @end
 
 #endif  // REMOTING_IOS_FACADE_REMOTING_SERVICE_H_