Oilpan: move DOM string collection objects to the Oilpan heap.

Source/modules/indexeddb/IDBObjectStore.cpp

Index: Source/modules/indexeddb/IDBObjectStore.cpp
diff --git a/Source/modules/indexeddb/IDBObjectStore.cpp b/Source/modules/indexeddb/IDBObjectStore.cpp
index d25293f6bd46a58b742177e93962cb82416244f4..b310a0f16f27f5323327fb01b6f7c71d6e96f768 100644
--- a/Source/modules/indexeddb/IDBObjectStore.cpp
+++ b/Source/modules/indexeddb/IDBObjectStore.cpp
@@ -66,10 +66,10 @@ ScriptValue IDBObjectStore::keyPath(NewScriptState* scriptState) const
     return idbAnyToScriptValue(scriptState, IDBAny::create(m_metadata.keyPath));
 }
 
-PassRefPtr<DOMStringList> IDBObjectStore::indexNames() const
+PassRefPtrWillBeRawPtr<DOMStringList> IDBObjectStore::indexNames() const
 {
     IDB_TRACE("IDBObjectStore::indexNames");
-    RefPtr<DOMStringList> indexNames = DOMStringList::create();
+    RefPtrWillBeRawPtr<DOMStringList> indexNames = DOMStringList::create();
     for (IDBObjectStoreMetadata::IndexMap::const_iterator it = m_metadata.indexes.begin(); it != m_metadata.indexes.end(); ++it)
         indexNames->append(it->value.name);
     indexNames->sort();