components: Cleanup class/struct fwd declarations

components/autofill/core/browser/autofill_data_model.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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DATA_MODEL_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DATA_MODEL_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "components/autofill/core/browser/form_group.h"
 
 namespace autofill {
 
-class AutofillType;
-
 // This class is an interface for the primary data models that back Autofill.
 // The information in objects of this class is managed by the
 // PersonalDataManager.
 class AutofillDataModel : public FormGroup {
  public:
   AutofillDataModel(const std::string& guid, const std::string& origin);
   ~AutofillDataModel() override;
 
   // Returns true if the data in this model was entered directly by the user,
   // rather than automatically aggregated.
@@ skipping 53 matching lines @@
   // Returns a score based on both the recency (relative to |time|) and
   // frequency for the model. The score is a negative number where a higher
   // value is more relevant. |time| is passed as a parameter to ensure
   // consistent results.
   double GetFrecencyScore(base::Time time) const;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DATA_MODEL_H_