components: Cleanup class/struct fwd declarations

components/autofill/core/browser/form_structure.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_FORM_STRUCTURE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_FORM_STRUCTURE_H_
 
 #include <stddef.h>
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "components/autofill/core/browser/autofill_field.h"
 #include "components/autofill/core/browser/autofill_type.h"
 #include "components/autofill/core/browser/field_types.h"
 #include "components/autofill/core/browser/proto/server.pb.h"
 #include "url/gurl.h"
 
-class XmlWriter;
-
 enum UploadRequired {
   UPLOAD_NOT_REQUIRED,
   UPLOAD_REQUIRED,
   USE_UPLOAD_RATES
 };
 
 namespace base {
 class TimeTicks;
 }
 
-namespace buzz {
-class XmlElement;
-}
-
 namespace rappor {
 class RapporService;
 }
 
 namespace autofill {
 
 struct FormData;
 struct FormDataPredictions;
 
 // FormStructure stores a single HTML form together with the values entered
@@ skipping 266 matching lines @@
   // The unique signature for this form, composed of the target url domain,
   // the form name, and the form field names in a 64-bit hash.
   FormSignature form_signature_;
 
   DISALLOW_COPY_AND_ASSIGN(FormStructure);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_FORM_STRUCTURE_H_