Remove TODO from gcloud.storage.bucket.

Re-introduced in 2f93065 after
being removed for #162 as part of the effort in #175.

Author: dhermes

gcloud/storage/bucket.py

@@ -258,7 +258,6 @@ def upload_file(self, filename, key=None):
         return key.set_contents_from_filename(filename)
 
     def upload_file_object(self, fh, key=None):
-        # TODO: What do we do about overwriting data?
         """Shortcut method to upload a file object into this bucket.
 
         Use this method to quickly put a local file in Cloud Storage.