chrome: Cleanup class/struct forward declarations

chrome/browser/browsing_data/browsing_data_indexed_db_helper.h

 // Copyright (c) 2012 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_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 
 #include <stddef.h>
 
 #include <list>
 #include <set>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "content/public/browser/indexed_db_context.h"
 #include "content/public/browser/indexed_db_info.h"
 #include "url/gurl.h"
 
-class Profile;
-
 // BrowsingDataIndexedDBHelper is an interface for classes dealing with
 // aggregating and deleting browsing data stored in indexed databases.  A
 // client of this class need to call StartFetching from the UI thread to
 // initiate the flow, and it'll be notified by the callback in its UI thread at
 // some later point.
 class BrowsingDataIndexedDBHelper
     : public base::RefCountedThreadSafe<BrowsingDataIndexedDBHelper> {
  public:
   using FetchCallback =
       base::Callback<void(const std::list<content::IndexedDBInfo>&)>;
@@ skipping 68 matching lines @@
 
  private:
   ~CannedBrowsingDataIndexedDBHelper() override;
 
   std::set<PendingIndexedDBInfo> pending_indexed_db_info_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataIndexedDBHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_