Service Worker: Improve some exception messages (Chromium).

content/common/service_worker/service_worker_types.cc

Index: content/common/service_worker/service_worker_types.cc
diff --git a/content/common/service_worker/service_worker_types.cc b/content/common/service_worker/service_worker_types.cc
index 137290b49da684711cd9e13d964de5de50c8bfa1..ea7144e3cc469a561194d26e1ded7bec10bff13a 100644
--- a/content/common/service_worker/service_worker_types.cc
+++ b/content/common/service_worker/service_worker_types.cc
@@ -6,6 +6,13 @@
 
 namespace content {
 
+const char kServiceWorkerRegisterErrorPrefix[] =
+    "Failed to register a ServiceWorker: ";
+const char kServiceWorkerUnregisterErrorPrefix[] =
+    "Failed to unregister a ServiceWorkerRegistration: ";
+const char kServiceWorkerGetRegistrationErrorPrefix[] =
+    "Failed to get a ServiceWorkerRegistration: ";
+
 ServiceWorkerFetchRequest::ServiceWorkerFetchRequest()
     : mode(FETCH_REQUEST_MODE_NO_CORS),
       request_context_type(REQUEST_CONTEXT_TYPE_UNSPECIFIED),