CheckHasServiceWorkerCallback always called on the UI thread

content/browser/service_worker/service_worker_context_wrapper.cc

Index: content/browser/service_worker/service_worker_context_wrapper.cc
diff --git a/content/browser/service_worker/service_worker_context_wrapper.cc b/content/browser/service_worker/service_worker_context_wrapper.cc
index 0aeb9ed2429b6dd5fa65679b9a479ce4a106d184..6c5881189fa43ed89a803e5713a44b2945f2cf9e 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.cc
+++ b/content/browser/service_worker/service_worker_context_wrapper.cc
@@ -570,7 +570,7 @@ void ServiceWorkerContextWrapper::CheckHasServiceWorker(
     return;
   }
   if (!context_core_) {
-    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                             base::Bind(callback, false));
     return;
   }