Fix OAuth2CustomAuthorizer

Author: p2

Sources/Base/OAuth2CustomAuthorizerUI.swift

@@ -31,7 +31,7 @@ public protocol OAuth2CustomAuthorizerUI {
 	- parameter fromContext:     The presenting context, typically another controller of platform-dependent type
 	- parameter animated:        Whether the presentation should be animated
 	*/
-	func present(loginController: AnyObject?, fromContext context: AnyObject?, animated: Bool) throws
+	func present(loginController: AnyObject, fromContext context: AnyObject?, animated: Bool) throws
 
 	/**
 	This function must dismiss the login controller.

Sources/iOS/OAuth2CustomAuthorizer+iOS.swift

@@ -45,7 +45,7 @@ public class OAuth2CustomAuthorizer: OAuth2CustomAuthorizerUI {
 	- parameter context:         The parent controller to use to present the login controller.
 	- parameter animated:        Whether the presentation should be animated.
 	*/
-	public func present(loginController: OAuth2LoginController, fromContext context: AnyObject?, animated: Bool) throws {
+	public func present(loginController: AnyObject, fromContext context: AnyObject?, animated: Bool) throws {
 		guard let parentController = context as? UIViewController else {
 			throw context == nil ? OAuth2Error.noAuthorizationContext : OAuth2Error.invalidAuthorizationContext
 		}

Sources/macOS/OAuth2CustomAuthorizer+macOS.swift

@@ -46,15 +46,13 @@ public class OAuth2CustomAuthorizer: OAuth2CustomAuthorizerUI {
 	- parameter fromContext:     The controller to which present the login controller. Should be a `NSViewController`
 	- parameter animated:        Whether the presentation should be animated.
 	*/
-	public func present(loginController: AnyObject?, fromContext context: AnyObject?, animated: Bool) throws {
+	public func present(loginController: AnyObject, fromContext context: AnyObject?, animated: Bool) throws {
 		guard #available(macOS 10.10, *) else {
 			throw OAuth2Error.generic("Native authorizing is only available in OS X 10.10 and later")
 		}
-		
 		guard let parentController = context as? NSViewController else {
 			throw context == nil ? OAuth2Error.noAuthorizationContext : OAuth2Error.invalidAuthorizationContext
 		}
-		
 		guard let controller = loginController as? NSViewController else {
 			throw OAuth2Error.invalidLoginController(actualType: String(describing: type(of: loginController)),
 													 expectedType: String(describing: NSViewController.self))