Don't terminate SharedWorker while loading the script.

content/worker/websharedworker_stub.cc

Index: content/worker/websharedworker_stub.cc
diff --git a/content/worker/websharedworker_stub.cc b/content/worker/websharedworker_stub.cc
index a2471df4a04783b8213ad403983d47297ce583fa..2737f6c422786f1ac3e74526ec7b8f9f2e490e5a 100644
--- a/content/worker/websharedworker_stub.cc
+++ b/content/worker/websharedworker_stub.cc
@@ -102,11 +102,11 @@ void WebSharedWorkerStub::OnConnect(int sent_message_port_id, int routing_id) {
 }
 
 void WebSharedWorkerStub::OnTerminateWorkerContext() {
-  impl_->terminateWorkerContext();
-
+  running_ = false;
   // Call the client to make sure context exits.
   EnsureWorkerContextTerminates();
-  running_ = false;
+  // This may call "delete this" via WorkerScriptLoadFailed and Shutdown.
+  impl_->terminateWorkerContext();
 }
 
 void WebSharedWorkerStub::WorkerScriptLoaded() {