chrome: Cleanup class/struct forward declarations

chrome/browser/ui/autofill/credit_card_scanner_controller.h

 // Copyright 2014 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 CHROME_BROWSER_UI_AUTOFILL_CREDIT_CARD_SCANNER_CONTROLLER_H_
 #define CHROME_BROWSER_UI_AUTOFILL_CREDIT_CARD_SCANNER_CONTROLLER_H_
 
 #include "components/autofill/core/browser/autofill_client.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace autofill {
 
-class CreditCardScannerView;
-
 // Controller for the credit card scanner UI. The controller deletes itself
 // after the view is dismissed.
 class CreditCardScannerController {
  public:
   // Returns true if both platform and device support scanning credit cards. The
   // platform must have the required APIs. The device must have, e.g., a camera.
   static bool HasCreditCardScanFeature();
 
   // Shows the UI to scan a credit card. The UI is associated with the
   // |web_contents|. Notifies the |delegate| when scanning completes
   // successfully. Destroys itself when the UI is dismissed. Should be called
   // only if HasCreditCardScanScanFeature() returns true.
   static void ScanCreditCard(
       content::WebContents* web_contents,
       const AutofillClient::CreditCardScanCallback& callback);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_CREDIT_CARD_SCANNER_CONTROLLER_H_