Updated MutableObjectTest.Sync_Successful.
Updated MutableObjectTest.Sync_Successful.

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