Fetch file's data and return proper File object.

def Get(self):
    """Fetch file's data and return proper File object."""

    args = vfs_pb2.ApiGetFileDetailsArgs(
        client_id=self.client_id, file_path=self.path)
    data = self._context.SendRequest("GetFileDetails", args).file
    return File(client_id=self.client_id, data=data, context=self._context)