Discard duplicate includes of files from storage

storage/browser/database/database_tracker.cc

 // 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.
 
 #include "storage/browser/database/database_tracker.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
-#include "base/files/file.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/net_errors.h"
 #include "sql/connection.h"
 #include "sql/meta_table.h"
 #include "sql/transaction.h"
 #include "storage/browser/database/database_quota_client.h"
 #include "storage/browser/database/database_util.h"
@@ skipping 836 matching lines @@
   if (!db_tracker_thread_->BelongsToCurrentThread()) {
     db_tracker_thread_->PostTask(
         FROM_HERE,
         base::Bind(&DatabaseTracker::SetForceKeepSessionState, this));
     return;
   }
   force_keep_session_state_ = true;
 }
 
 }  // namespace storage