[CRD iOS] Implementing save to keychain and user defaults for login info. Refactor remoting service.

remoting/client/ios/app/app_delegate.mm

Index: remoting/client/ios/app/app_delegate.mm
diff --git a/remoting/client/ios/app/app_delegate.mm b/remoting/client/ios/app/app_delegate.mm
index ae4b24f45df0810b32e9775a519965c03fe48b0a..7dc13697669a2dd6b04f9925d716a1adb496669b 100644
--- a/remoting/client/ios/app/app_delegate.mm
+++ b/remoting/client/ios/app/app_delegate.mm
@@ -13,6 +13,7 @@
 #include "ui/base/resource/resource_bundle.h"
 
 #import "remoting/client/ios/app/remoting_view_controller.h"
+#import "remoting/client/ios/facade/remoting_authentication.h"
 #import "remoting/client/ios/facade/remoting_service.h"
 
 @implementation AppDelegate
@@ -45,7 +46,7 @@
   }
   NSString* authorizationCode = [components objectForKey:@"code"];
 
-  [[RemotingService SharedInstance]
+  [[RemotingService SharedInstance].authentication
       authenticateWithAuthorizationCode:authorizationCode];
 
   [self launchRemotingViewController];