discovery.py: remove unused oauth2client import (#492)
Remove unused GoogleCredentials import from oauth2client
Decrease dependency from oauth2client, discovery should be able to work
without oauth2client installed
diff --git a/googleapiclient/discovery.py b/googleapiclient/discovery.py
index fe19022..5c86249 100644
--- a/googleapiclient/discovery.py
+++ b/googleapiclient/discovery.py
@@ -72,7 +72,6 @@
from googleapiclient.model import MediaModel
from googleapiclient.model import RawModel
from googleapiclient.schema import Schemas
-from oauth2client.client import GoogleCredentials
# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
# in '_helpers'.