Make the request initiator Optional

content/browser/service_worker/service_worker_url_request_job.cc

Index: content/browser/service_worker/service_worker_url_request_job.cc
diff --git a/content/browser/service_worker/service_worker_url_request_job.cc b/content/browser/service_worker/service_worker_url_request_job.cc
index 2f852939088c0ae4f6fc15753280a7599f56b06b..2d7fd10548ef806557359a557924b1ca9b237e03 100644
--- a/content/browser/service_worker/service_worker_url_request_job.cc
+++ b/content/browser/service_worker/service_worker_url_request_job.cc
@@ -776,8 +776,9 @@ bool ServiceWorkerURLRequestJob::IsFallbackToRendererNeeded() const {
          fetch_type_ != ServiceWorkerFetchType::FOREIGN_FETCH &&
          (request_mode_ == FETCH_REQUEST_MODE_CORS ||
           request_mode_ == FETCH_REQUEST_MODE_CORS_WITH_FORCED_PREFLIGHT) &&
-         !request()->initiator().IsSameOriginWith(
-             url::Origin(request()->url()));
+         (!request()->initiator().has_value() ||

[horo, 2016/11/04 03:13:35]

Just to confirm: The initiator must be set when the request is not main resource
load. Right? 

[clamy, 2016/11/04 16:03:50]

Yes.

+          !request()->initiator()->IsSameOriginWith(
+              url::Origin(request()->url())));
 }
 
 void ServiceWorkerURLRequestJob::SetResponseBodyType(ResponseBodyType type) {