Use callback_forward.h instead of callback.h where possible.

chrome/browser/safe_browsing/safe_browsing_store_file.h

 // Copyright (c) 2011 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_SAFE_BROWSING_SAFE_BROWSING_STORE_FILE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_STORE_FILE_H_
 #pragma once
 
 #include <set>
 #include <vector>
 
 #include "chrome/browser/safe_browsing/safe_browsing_store.h"
 
+#include "base/callback.h"
 #include "base/file_util.h"
 
 // Implement SafeBrowsingStore in terms of a flat file.  The file
 // format is pretty literal:
 //
 // int32 magic;             // magic number "validating" file
 // int32 version;           // format version
 //
 // // Counts for the various data which follows the header.
 // uint32 add_chunk_count;   // Chunks seen, including empties.
@@ skipping 251 matching lines @@
 
   // Tracks whether corruption has already been seen in the current
   // update, so that only one instance is recorded in the stats.
   // TODO(shess): Remove with format-migration support.
   bool corruption_seen_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingStoreFile);
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_STORE_FILE_H_