Reland of move header dependencies from sequence_checker.h to sequenced_worker_pool.h

extensions/browser/api/api_resource_manager.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 EXTENSIONS_BROWSER_API_API_RESOURCE_MANAGER_H_
 #define EXTENSIONS_BROWSER_API_API_RESOURCE_MANAGER_H_
 
 #include <map>
 #include <memory>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/scoped_observer.h"
 #include "base/sequence_checker.h"
+#include "base/sequenced_task_runner.h"
 #include "base/threading/non_thread_safe.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/browser/process_manager_observer.h"
 #include "extensions/common/extension.h"
 
 namespace extensions {
@@ skipping 391 matching lines @@
         ->GetSequencedTaskRunnerWithShutdownBehavior(
             content::BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
                 T::kSequenceToken),
             T::kShutdownBehavior);
   }
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_API_RESOURCE_MANAGER_H_