Add ref count to service workers for extension API.

content/browser/service_worker/service_worker_context_wrapper.h

Index: content/browser/service_worker/service_worker_context_wrapper.h
diff --git a/content/browser/service_worker/service_worker_context_wrapper.h b/content/browser/service_worker/service_worker_context_wrapper.h
index 12c8b7220cd833464c774c76357a7bb6408573c5..352b352cd5a3a87c4d6668b6cae2b1eae4ea2e35 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -112,6 +112,10 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
       blink::WebNavigationHintType type,
       int render_process_id,
       const ResultCallback& callback) override;
+  bool IncrementPendingActivity(int64_t service_worker_version_id,
+                                const std::string& request_uuid) override;
+  bool DecrementPendingActivity(int64_t service_worker_version_id,
+                                const std::string& request_uuid) override;
 
   // These methods must only be called from the IO thread.
   ServiceWorkerRegistration* GetLiveRegistration(int64_t registration_id);