components: Cleanup class/struct fwd declarations

components/autofill/content/browser/risk/fingerprint.h

 // Copyright 2013 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.
 //
 // Generates fingerprints appropriate for sending to the Google Wallet Risk
 // engine, which is the fraud-detection engine used for purchases powered by
 // Google Wallet.  A fingerprint encapsulates machine and user characteristics.
 // Because much of the data is privacy-sensitive, fingerprints should only be
 // generated with explicit user consent, including consent to gather geolocation
 // data.
 
 #ifndef COMPONENTS_AUTOFILL_CONTENT_BROWSER_RISK_FINGERPRINT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_BROWSER_RISK_FINGERPRINT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "components/autofill/core/browser/autofill_client.h"
 
-class PrefService;
-
 namespace base {
 class Time;
 }
 
 namespace content {
 class WebContents;
 }
 
 namespace gfx {
 class Rect;
@@ skipping 21 matching lines @@
     const std::string& accept_languages,
     const base::Time& install_time,
     const std::string& app_locale,
     const std::string& user_agent,
     const base::Callback<void(std::unique_ptr<Fingerprint>)>& callback);
 
 }  // namespace risk
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_BROWSER_RISK_FINGERPRINT_H_