chrome: Cleanup class/struct forward declarations

chrome/browser/android/history_report/delta_file_commons.h

 // Copyright 2015 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 CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_COMMONS_H_
 #define CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_COMMONS_H_
 
 #include <stdint.h>
 
 #include "base/strings/string16.h"
 #include "chrome/browser/android/proto/delta_file.pb.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/history/core/browser/history_types.h"
 
-class GURL;
-
 namespace history_report {
 
 // Represents a single delta file entry with additional data.
 class DeltaFileEntryWithData {
  public:
   explicit DeltaFileEntryWithData(DeltaFileEntry entry);
   DeltaFileEntryWithData(const DeltaFileEntryWithData& other);
   ~DeltaFileEntryWithData();
 
   // Returns sequence number of this delta file entry.
@@ skipping 38 matching lines @@
   DeltaFileEntry entry_;
   bool data_set_;
   history::URLRow data_;
   bool is_bookmark_;
   base::string16 bookmark_title_;
 };
 
 }  // namespace history_report
 
 #endif  // CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_COMMONS_H_