Bug 726961 - Remove unused variable database from IDBIndex::Create; r=khuey

dom/indexedDB/IDBIndex.cpp

@@ -308,8 +308,6 @@ IDBIndex::Create(IDBObjectStore* aObjectStore,
   NS_ASSERTION(aObjectStore, "Null pointer!");
   NS_ASSERTION(aIndexInfo, "Null pointer!");
 
-  IDBDatabase* database = aObjectStore->Transaction()->Database();
-
   nsRefPtr<IDBIndex> index = new IDBIndex();
 
   index->mObjectStore = aObjectStore;