[ObjC ARC] Converts ios/chrome/app:app_internal to ARC.

ios/chrome/app/main_controller_private.h

 // Copyright 2015 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.
 
 #ifndef IOS_CHROME_APP_MAIN_CONTROLLER_PRIVATE_H_
 #define IOS_CHROME_APP_MAIN_CONTROLLER_PRIVATE_H_
 
 #import "base/ios/block_types.h"
 #include "components/browsing_data/core/browsing_data_utils.h"
 #import "ios/chrome/app/application_delegate/browser_launcher.h"
@@ skipping 34 matching lines @@
 
 @end
 
 // Methods that only exist for tests.
 @interface MainController (TestingOnly)
 
 @property(nonatomic, readonly) DeviceSharingManager* deviceSharingManager;
 @property(nonatomic, retain)
     UIViewController<TabSwitcher>* tabSwitcherController;
 @property(nonatomic, readonly)
-    SettingsNavigationController* settingsNavigationController;
-@property(nonatomic, readonly)
     SigninInteractionController* signinInteractionController;
 
 // The top presented view controller that is not currently being dismissed.
 @property(nonatomic, readonly) UIViewController* topPresentedViewController;
 
 // Tab switcher state.
 @property(nonatomic, getter=isTabSwitcherActive) BOOL tabSwitcherActive;
 @property(nonatomic, readonly) BOOL dismissingTabSwitcher;
 
 // Sets up MainController for testing; clears history, closes all tabs and
 // switches to the main BVC. |completionHandler| is called when MainController
 // is completely set up for testing.
 - (void)setUpForTestingWithCompletionHandler:(ProceduralBlock)completionHandler;
 
 // Sets the internal startup state to indicate that the launch was triggered
 // by an external app opening the given URL.
 - (void)setStartupParametersWithURL:(const GURL&)launchURL;
 
 // Sets the internal state to indicate that the app has been foregrounded.
 - (void)setUpAsForegrounded;
 
 @end
 
 #endif  // IOS_CHROME_APP_MAIN_CONTROLLER_PRIVATE_H_