IndexedDB: Return refs from a few const property accessors

Source/modules/indexeddb/IDBObjectStore.h

Index: Source/modules/indexeddb/IDBObjectStore.h
diff --git a/Source/modules/indexeddb/IDBObjectStore.h b/Source/modules/indexeddb/IDBObjectStore.h
index f010c9ca02f474a4ddd0609af83fdd55ceb3147c..a4e8d3eec4f5b0bd5a7f26a277170ab9516c65d8 100644
--- a/Source/modules/indexeddb/IDBObjectStore.h
+++ b/Source/modules/indexeddb/IDBObjectStore.h
@@ -57,9 +57,9 @@ public:
 
     // Implement the IDBObjectStore IDL
     int64_t id() const { return m_metadata.id; }
-    const String name() const { return m_metadata.name; }
+    const String& name() const { return m_metadata.name; }
     PassRefPtr<IDBAny> keyPathAny() const { return IDBAny::create(m_metadata.keyPath); }
-    const IDBKeyPath keyPath() const { return m_metadata.keyPath; }
+    const IDBKeyPath& keyPath() const { return m_metadata.keyPath; }
     PassRefPtr<DOMStringList> indexNames() const;
     PassRefPtr<IDBTransaction> transaction() const { return m_transaction; }
     bool autoIncrement() const { return m_metadata.autoIncrement; }