Reland of Check that all shared workers are terminated.

content/browser/shared_worker/shared_worker_service_impl.cc

Index: content/browser/shared_worker/shared_worker_service_impl.cc
diff --git a/content/browser/shared_worker/shared_worker_service_impl.cc b/content/browser/shared_worker/shared_worker_service_impl.cc
index 03b279369e10145bb8b9bf8ecce92152fd5b7b18..212028856ad7e3de6af1aa5fd53fb2fa76f40dbc 100644
--- a/content/browser/shared_worker/shared_worker_service_impl.cc
+++ b/content/browser/shared_worker/shared_worker_service_impl.cc
@@ -444,6 +444,15 @@
   FOR_EACH_OBSERVER(WorkerServiceObserver,
                     observers_,
                     WorkerDestroyed(worker_process_id, worker_route_id));
+}
+
+// TODO(alokp): Remove after collecting crash data.
+// Temporary checks to verify that all shared workers are terminated.
+// It is suspected that shared workers prevent render process hosts
+// from shutting down: crbug.com/608049
+void SharedWorkerServiceImpl::CheckAllWorkersTerminated() {
+  std::set<int> dependent_renderers = GetRenderersWithWorkerDependency();
+  CHECK_EQ(0u, dependent_renderers.size());
 }
 
 blink::WebWorkerCreationError