Revert of Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

chrome/browser/supervised_user/supervised_user_url_filter.h

 // Copyright 2014 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_SUPERVISED_USER_SUPERVISED_USER_URL_FILTER_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_URL_FILTER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/values.h"
 #include "chrome/browser/safe_search_api/safe_search_url_checker.h"
 #include "chrome/browser/supervised_user/supervised_user_site_list.h"
 #include "chrome/browser/supervised_user/supervised_users.h"
 #include "components/supervised_user_error_page/supervised_user_error_page.h"
 #include "third_party/re2/src/re2/re2.h"
 
 class GURL;
 class SupervisedUserBlacklist;
 
-namespace base {
-class TaskRunner;
-}
-
 namespace net {
 class URLRequestContextGetter;
 }
 
+class GURL;
+
 // This class manages the filtering behavior for a given URL, i.e. it tells
 // callers if a given URL should be allowed, blocked or warned about. It uses
 // information from multiple sources:
 //   * A default setting (allow, block or warn).
 //   * The set of installed and enabled whitelists which contain URL patterns
 //     and hostname hashes that should be allowed.
 //   * User-specified manual overrides (allow or block) for either sites
 //     (hostnames) or exact URLs, which take precedence over the previous
 //     sources.
 // References to it can be passed around on different threads (the refcounting
@@ skipping 173 matching lines @@
   re2::RE2 amp_cache_path_regex_;
   re2::RE2 google_amp_viewer_path_regex_;
   re2::RE2 google_web_cache_query_regex_;
 
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserURLFilter);
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_URL_FILTER_H_