Bypass ServiceWorkers for synchronous resource loads.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 7b09885c9f353f06f9c4158acf0ada39e32c0240..fc40f4fa8b8c0247105f1976b2a440ae3a25e720 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -1145,7 +1145,7 @@ void ResourceDispatcherHostImpl::BeginRequest(
       blob_context,
       child_id,
       request_data.service_worker_provider_id,
-      request_data.skip_service_worker,
+      request_data.skip_service_worker || is_sync_load,

[mmenke, 2014/09/29 19:15:56]

nit:  Think it's worth a short comment about this.  Something along the lines of
"Don't use service worker for synchronous loads, to prevent hanging on a blocked
renderer"

[michaeln, 2014/09/29 19:34:00]

Done.

       request_data.resource_type,
       request_data.request_body);