ServiceWorker: Create sequenced task runner for database

content/browser/service_worker/service_worker_context_core.h

Index: content/browser/service_worker/service_worker_context_core.h
diff --git a/content/browser/service_worker/service_worker_context_core.h b/content/browser/service_worker/service_worker_context_core.h
index 55d64ae1807708b8b98d0cfac92427e23ce3dd91..54dcc9db6e37f4b2645c630fd4dcc08ff265bb0d 100644
--- a/content/browser/service_worker/service_worker_context_core.h
+++ b/content/browser/service_worker/service_worker_context_core.h
@@ -25,6 +25,7 @@ class GURL;
 
 namespace base {
 class FilePath;
+class SequencedTaskRunner;
 }
 
 namespace quota {
@@ -86,6 +87,7 @@ class CONTENT_EXPORT ServiceWorkerContextCore
   // be called on the thread which called AddObserver() of |observer_list|.
   ServiceWorkerContextCore(
       const base::FilePath& user_data_directory,
+      base::SequencedTaskRunner* database_task_runner,
       quota::QuotaManagerProxy* quota_manager_proxy,
       ObserverListThreadSafe<ServiceWorkerContextObserver>* observer_list,
       scoped_ptr<ServiceWorkerProcessManager> process_manager);