refer to WebServiceWorkerCacheError values in c++03 style

Source/modules/serviceworkers/CacheStorage.cpp

Index: Source/modules/serviceworkers/CacheStorage.cpp
diff --git a/Source/modules/serviceworkers/CacheStorage.cpp b/Source/modules/serviceworkers/CacheStorage.cpp
index 2eadf137b3aedc8bfceefe4914e39c59556a4f35..345acfb523a1a2a6d74dae5a08c3aa25d1530a88 100644
--- a/Source/modules/serviceworkers/CacheStorage.cpp
+++ b/Source/modules/serviceworkers/CacheStorage.cpp
@@ -19,11 +19,11 @@ const char* CacheErrorToString(WebServiceWorkerCacheError reason)
 {
     // FIXME: Construct correct DOM error objects rather than returning strings.
     switch (reason) {
-    case WebServiceWorkerCacheError::WebServiceWorkerCacheErrorNotImplemented:
+    case WebServiceWorkerCacheErrorNotImplemented:
         return "not implemented";
-    case WebServiceWorkerCacheError::WebServiceWorkerCacheErrorNotFound:
+    case WebServiceWorkerCacheErrorNotFound:
         return "not found";
-    case WebServiceWorkerCacheError::WebServiceWorkerCacheErrorExists:
+    case WebServiceWorkerCacheErrorExists:
         return "entry already exists";
     default:
         ASSERT_NOT_REACHED();