Allow cancelling the currently-presented dialog.

ios/chrome/browser/ui/dialogs/dialog_presenter.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_BROWSER_UI_DIALOGS_DIALOG_PRESENTER_H_
 #define IOS_CHROME_BROWSER_UI_DIALOGS_DIALOG_PRESENTER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "base/ios/block_types.h"
@@ skipping 68 matching lines @@
 
 // Create an title for the alert base on the URL.
 + (NSString*)localizedTitleForJavaScriptAlertFromPage:(const GURL&)pageURL;
 
 @end
 
 @interface DialogPresenter (ExposedForTesting)
 // The dialog currently being shown.
 @property(nonatomic, readonly) AlertCoordinator* presentedDialogCoordinator;
 
-// Called when a button in |dialog| is tapped.
-- (void)buttonWasTappedForCoordinator:(AlertCoordinator*)coordinator;
+// Called when |coordinator| is stopped.
+- (void)dialogCoordinatorWasStopped:(AlertCoordinator*)coordinator;
 
 @end
 
 // Delegate protocol for DialogPresenter.
 @protocol DialogPresenterDelegate<NSObject>
 
 // Called by |presenter| before showing the queued modal dialog associated with
 // |context|.
 - (void)dialogPresenter:(DialogPresenter*)presenter
     willShowDialogForWebState:(web::WebState*)webState;
 
 // Whether the delegate is presenting another View Controller.
 @property(nonatomic, assign) BOOL presenting;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_DIALOGS_DIALOG_PRESENTER_H_