[CRD iOS] Refactor an interface for RemotingAuthorization

remoting/ios/app/app_view_controller_chromium.mm

Index: remoting/ios/app/app_view_controller_chromium.mm
diff --git a/remoting/ios/app/app_view_controller_chromium.mm b/remoting/ios/app/app_view_controller_chromium.mm
index fb91461f63e9be05bda0ab2a8c9be467f834e5de..b7bf4553e2dc94082b3f10b9cec92b78ec611ebf 100644
--- a/remoting/ios/app/app_view_controller_chromium.mm
+++ b/remoting/ios/app/app_view_controller_chromium.mm
@@ -11,11 +11,11 @@
 #include "base/logging.h"
 
 #import "remoting/ios/app/remoting_menu_view_controller.h"
+#import "remoting/ios/facade/remoting_oauth_authentication.h"
 
 // The Chromium implementation for the AppViewController. It simply shows the
 // menu modally.
 @interface AppViewController () {
-  UIViewController* _mainViewController;
 
   RemotingMenuViewController* _menuController;  // nullable
 }
@@ -23,20 +23,16 @@
 
 @implementation AppViewController
 
-- (instancetype)initWithMainViewController:
-    (UIViewController*)mainViewController {
+@synthesize authentication = _authentication;
+@synthesize mainViewController = _mainViewController;
+
+- (instancetype)init {
   if (self = [super init]) {
-    _mainViewController = mainViewController;
+    _authentication = [[RemotingOAuthAuthentication alloc] init];
   }
   return self;
 }
 
-- (void)viewDidLoad {
-  [self addChildViewController:_mainViewController];
-  [self.view addSubview:_mainViewController.view];
-  [_mainViewController didMoveToParentViewController:self];
-}
-
 #pragma mark - AppController
 - (void)showMenuAnimated:(BOOL)animated {
   if (_menuController != nil && [_menuController isBeingPresented]) {
@@ -66,4 +62,14 @@
   return _mainViewController;
 }
 
+#pragma mark - Properties
+
+- (void)setMainViewController:(UIViewController*)mainViewController {
+  DCHECK(self.view != nil);
+  _mainViewController = mainViewController;
+  [self addChildViewController:_mainViewController];
+  [self.view addSubview:_mainViewController.view];
+  [_mainViewController didMoveToParentViewController:self];
+}
+
 @end