Teach CrOS's OfflineResourceThrottle about ServiceWorkers so it know longer presents its offline in…

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 7df3cb093b1f33da2fa2aa62bbdcefabb127dbe4..56367eee1cebbe645a0e4dc537f57aa68eec1d45 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -72,6 +72,10 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
                              const ResultCallback& continuation) override;
   void UnregisterServiceWorker(const GURL& pattern,
                                const ResultCallback& continuation) override;
+  void CanHandleMainResourceOffline(
+      const GURL& url,
+      const GURL& first_party,
+      const net::CompletionCallback& callback) override;
   void GetAllOriginsInfo(const GetUsageInfoCallback& callback) override;
   void DeleteForOrigin(const GURL& origin_url) override;