Push API: Validate storage before returning cached subscriptions

content/public/common/push_messaging_status.cc

Index: content/public/common/push_messaging_status.cc
diff --git a/content/public/common/push_messaging_status.cc b/content/public/common/push_messaging_status.cc
index abee3207eff2ac45fd04b4a11b627257ebf74c73..664ce1632b49bbcc18df8bd9aa24336c5703e353 100644
--- a/content/public/common/push_messaging_status.cc
+++ b/content/public/common/push_messaging_status.cc
@@ -57,6 +57,9 @@ const char* PushRegistrationStatusToString(PushRegistrationStatus status) {
       return "Registration failed - A subscription with a different "
              "applicationServerKey (or gcm_sender_id) already exists; to "
              "change the applicationServerKey, unsubscribe then resubscribe.";
+
+    case PUSH_REGISTRATION_STATUS_STORAGE_CORRUPT:
+      return "Registration failed - storage corrupt";
   }
   NOTREACHED();
   return "";