components: Cleanup class/struct fwd declarations

components/autofill/core/browser/ui/card_unmask_prompt_view.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 COMPONENTS_AUTOFILL_CORE_BROWSER_UI_CARD_UNMASK_PROMPT_VIEW_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_UI_CARD_UNMASK_PROMPT_VIEW_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 
 namespace autofill {
 
-class CardUnmaskPromptController;
-
 // The cross-platform UI interface which prompts the user to unlock a masked
 // Wallet instrument (credit card). This object is responsible for its own
 // lifetime.
 class CardUnmaskPromptView {
  public:
   virtual void Show() = 0;
   virtual void ControllerGone() = 0;
   virtual void DisableAndWaitForVerification() = 0;
   virtual void GotVerificationResult(const base::string16& error_message,
                                      bool allow_retry) = 0;
 
  protected:
   CardUnmaskPromptView() {}
   virtual ~CardUnmaskPromptView() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CardUnmaskPromptView);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_UI_CARD_UNMASK_PROMPT_VIEW_H_