Propagate the status in ServiceWorkerURLRequestJob::OnReadCompleted

In current code, while reading a blob created by XMLHttpRequest, the status is set to IO_PENDING in ServiceWorkerURLRequestJob::ReadRawData.
But the status will not be updated even when complete reading.
So DCHECK(!request_->status().is_io_pending()) fails while reading the next chunk.

The status must be updated in OnReadCompleted.

BUG=382311

Review URL: https://codereview.chromium.org/315863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275995 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/service_worker/service_worker_url_request_job.cc

@@ -151,6 +151,7 @@ void ServiceWorkerURLRequestJob::OnResponseStarted(net::URLRequest* request) {
 
 void ServiceWorkerURLRequestJob::OnReadCompleted(net::URLRequest* request,
                                                  int bytes_read) {
+  SetStatus(request->status());
   if (!request->status().is_success()) {
     NotifyDone(request->status());
     return;