Check the ServiceWorker Version ID in EmbeddedWorkerInstance::Start() in release builds.

content/browser/service_worker/embedded_worker_instance.cc

Index: content/browser/service_worker/embedded_worker_instance.cc
diff --git a/content/browser/service_worker/embedded_worker_instance.cc b/content/browser/service_worker/embedded_worker_instance.cc
index 5efdd30f358f41b7c9781cc6a234ebad86994196..840b84c6e74bd09a6aace30202685b8b25083099 100644
--- a/content/browser/service_worker/embedded_worker_instance.cc
+++ b/content/browser/service_worker/embedded_worker_instance.cc
@@ -149,6 +149,9 @@ void EmbeddedWorkerInstance::Start(int64 service_worker_version_id,
     return;
   }
   DCHECK(status_ == STOPPED);
+  // TODO(horo): If we will see crashes here, we have to find the root cause of
+  // the invalid version ID. Otherwise change CHECK to DCHECK.
+  CHECK_NE(service_worker_version_id, kInvalidServiceWorkerVersionId);
   start_timing_ = base::TimeTicks::Now();
   status_ = STARTING;
   starting_phase_ = ALLOCATING_PROCESS;