[WIP] [service worker] Fix detach controller and fallback to network mechanism

content/child/service_worker/service_worker_dispatcher.cc

Index: content/child/service_worker/service_worker_dispatcher.cc
diff --git a/content/child/service_worker/service_worker_dispatcher.cc b/content/child/service_worker/service_worker_dispatcher.cc
index 8608ed0443095e6fcf25064c9ee7cab0299a03b5..165d8d7022581cbe96b765ee41bb9a2ac7a39bce 100644
--- a/content/child/service_worker/service_worker_dispatcher.cc
+++ b/content/child/service_worker/service_worker_dispatcher.cc
@@ -703,8 +703,12 @@ void ServiceWorkerDispatcher::OnSetControllerServiceWorker(
   scoped_ptr<ServiceWorkerHandleReference> handle_ref =
       ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_.get());
   ProviderContextMap::iterator provider = provider_contexts_.find(provider_id);
-  if (provider != provider_contexts_.end())
-    provider->second->OnSetControllerServiceWorker(handle_ref.Pass());
+  if (provider != provider_contexts_.end()) {
+    if (info.handle_id == kInvalidServiceWorkerVersionId)
+      provider->second->OnSetControllerServiceWorker(nullptr);
+    else
+      provider->second->OnSetControllerServiceWorker(handle_ref.Pass());
+  }
 
   ProviderClientMap::iterator found = provider_clients_.find(provider_id);
   if (found != provider_clients_.end()) {