Service Worker: Update stale workers

content/common/service_worker/service_worker_types.h

Index: content/common/service_worker/service_worker_types.h
diff --git a/content/common/service_worker/service_worker_types.h b/content/common/service_worker/service_worker_types.h
index 6aa97d4ef41737b4d5cf1f9ee92f91bc6cdb0835..6c2c36ff69974004167e7c09d2c64d5da8f8de07 100644
--- a/content/common/service_worker/service_worker_types.h
+++ b/content/common/service_worker/service_worker_types.h
@@ -52,6 +52,10 @@ static const int64 kInvalidServiceWorkerResponseId = -1;
 static const int kInvalidEmbeddedWorkerThreadId = -1;
 static const int kInvalidServiceWorkerClientId = 0;
 
+// The HTTP cache is bypassed for Service Worker scripts if the last network
+// fetch occurred over 24 hours ago.
+static const int kServiceWorkerScriptMaxCacheAgeInHours = 24;
+
 // ServiceWorker provider type.
 enum ServiceWorkerProviderType {
   SERVICE_WORKER_PROVIDER_UNKNOWN,