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

remoting/client/ios/app/app_delegate.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/client/ios/app/app_delegate.h"
 
 #include "base/logging.h"
 #include "ui/base/l10n/l10n_util.h"
 #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
 
 @synthesize window = _window;
 
 - (BOOL)application:(UIApplication*)application
     willFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
   self.window =
       [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
@@ skipping 12 matching lines @@
   NSArray* urlComponents = [[url query] componentsSeparatedByString:@"&"];
 
   for (NSString* componentPair in urlComponents) {
     NSArray* pair = [componentPair componentsSeparatedByString:@"="];
     NSString* key = [[pair firstObject] stringByRemovingPercentEncoding];
     NSString* value = [[pair lastObject] stringByRemovingPercentEncoding];
     [components setObject:value forKey:key];
   }
   NSString* authorizationCode = [components objectForKey:@"code"];
 
-  [[RemotingService SharedInstance]
+  [[RemotingService SharedInstance].authentication
       authenticateWithAuthorizationCode:authorizationCode];
 
   [self launchRemotingViewController];
   return YES;
 }
 
 - (void)launchRemotingViewController {
   RemotingViewController* vc = [[RemotingViewController alloc] init];
   self.window.rootViewController = vc;
   [self.window makeKeyAndVisible];
 }
 
 @end