components: Add out-of-line copy ctors for complex classes.

components/autofill/core/browser/card_unmask_delegate.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_CARD_UNMASK_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_CARD_UNMASK_DELEGATE_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
 
 namespace autofill {
 
 class CardUnmaskDelegate {
  public:
   struct UnmaskResponse {
     UnmaskResponse();
+    UnmaskResponse(const UnmaskResponse& other);
     ~UnmaskResponse();
 
     // User input data.
     base::string16 cvc;
 
     // Two digit month.
     base::string16 exp_month;
 
     // Four digit year.
     base::string16 exp_year;
 
     // State of "copy to this device" checkbox.
     bool should_store_pan;
   };
 
   // Called when the user has attempted a verification. Prompt is still
   // open at this point.
   virtual void OnUnmaskResponse(const UnmaskResponse& response) = 0;
 
   // Called when the unmask prompt is closed (e.g., cancelled).
   virtual void OnUnmaskPromptClosed() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_CARD_UNMASK_DELEGATE_H_