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

net/ssl/channel_id_service.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 NET_SSL_CHANNEL_ID_SERVICE_H_
 #define NET_SSL_CHANNEL_ID_SERVICE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/task_runner.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/ssl/channel_id_store.h"
 
+namespace base {
+class TaskRunner;
+}  // namespace base
+
 namespace crypto {
 class ECPrivateKey;
 }  // namespace crypto
 
 namespace net {
 
 class ChannelIDServiceJob;
 
 // A class for creating and fetching Channel IDs.
 
@@ skipping 146 matching lines @@
   uint64_t workers_created_;
 
   base::WeakPtrFactory<ChannelIDService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelIDService);
 };
 
 }  // namespace net
 
 #endif  // NET_SSL_CHANNEL_ID_SERVICE_H_