Updated object_proxy_test.go.
Updated object_proxy_test.go.

BanzaiMan/gcsfuse,BanzaiMan/gcsfuse,mbrukman/gcsfuse,kahing/gcsfuse,jacobsa/ratelimit,jacobsa/timeutil,GoogleCloudPlatform/gcsfuse,GoogleCloudPlatform/gcsfuse,GoogleCloudPlatform/gcsfuse