Add missing #include around sequenced_worker_pool.h in //chrome

chrome/browser/safe_browsing/local_database_manager.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.
 //
 // Safe Browsing Database Manager implementation that manages a local
 // database.  This is used by Desktop Chromium.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_LOCAL_DATABASE_MANAGER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_LOCAL_DATABASE_MANAGER_H_
 
@@ skipping 15 matching lines @@
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "chrome/browser/safe_browsing/protocol_manager.h"
 #include "chrome/browser/safe_browsing/safe_browsing_util.h"
 #include "components/safe_browsing_db/database_manager.h"
 #include "components/safe_browsing_db/safe_browsing_prefs.h"
 #include "components/safe_browsing_db/safebrowsing.pb.h"
 #include "components/safe_browsing_db/util.h"
 #include "url/gurl.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace safe_browsing {
 
 class SafeBrowsingService;
 class SafeBrowsingDatabase;
 struct V4ProtocolConfig;
 
@@ skipping 326 matching lines @@
 
   // Timeout to use for safe browsing checks.
   base::TimeDelta check_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalSafeBrowsingDatabaseManager);
 };  // class LocalSafeBrowsingDatabaseManager
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_LOCAL_DATABASE_MANAGER_H_