def remove_object_metadata_key(self, container, obj, key, prefix=None):
        """
        Removes the specified key from the storage object's metadata. If the key
        does not exist in the metadata, nothing is done.
        """
        self.set_object_metadata(container, obj, {key: ""}, prefix=prefix)
Removes the specified key from the storage object's metadata. If the key
        does not exist in the metadata, nothing is done.