Bug 769537: Actually use QuotaExceededError for database creation. r=bent

dom/indexedDB/OpenDatabaseHelper.cpp

@@ -1636,7 +1636,11 @@ OpenDatabaseHelper::DoDatabaseWork()
   nsCOMPtr<mozIStorageConnection> connection;
   rv = CreateDatabaseConnection(mName, dbFile, fileManagerDirectory,
                                 getter_AddRefs(connection));
-  NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
+  if (NS_FAILED(rv) &&
+      NS_ERROR_GET_MODULE(rv) != NS_ERROR_MODULE_DOM_INDEXEDDB) {
+    rv = NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
 
   rv = IDBFactory::LoadDatabaseInformation(connection, mDatabaseId,
                                            &mCurrentVersion, mObjectStores);
@@ -1838,6 +1842,11 @@ OpenDatabaseHelper::CreateDatabaseConnection(
     }
 
     rv = transaction.Commit();    
+    if (rv == NS_ERROR_FILE_NO_DEVICE_SPACE) {
+      // mozstorage translates SQLITE_FULL to NS_ERROR_FILE_NO_DEVICE_SPACE,
+      // which we know better as NS_ERROR_DOM_INDEXEDDB_QUOTA_ERR.
+      rv = NS_ERROR_DOM_INDEXEDDB_QUOTA_ERR;
+    }
     NS_ENSURE_SUCCESS(rv, rv);
   }