Kill worker process by way of a sync IPC message before it cleans up.

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 745b63c1956abf61d13cd564e4ef1667c38fa23b..79753eceed32dd2128ca76a581c832abb6522819 100644
--- a/content/worker/websharedworker_stub.cc
+++ b/content/worker/websharedworker_stub.cc
@@ -45,6 +45,14 @@ WebSharedWorkerStub::~WebSharedWorkerStub() {
   impl_->clientDestroyed();
   WorkerThread* worker_thread = WorkerThread::current();
   DCHECK(worker_thread);
+
+  // Send an IPC message to kill the worker process.
+  bool result = false;
+  worker_thread->Send(new WorkerProcessHostMsg_ForceKillWorker(
+      route_id_,
+      base::GetCurrentProcessHandle(),
+      &result));
+
   worker_thread->RemoveWorkerStub(this);
   worker_thread->RemoveRoute(route_id_);
   ChildProcess::current()->ReleaseProcess();