CCompute fix.
CCompute fix.

Bug from https://codereview.chromium.org/666673006, since slave_name isn't currently passed in.

BUG=
TBR=sheyang,vadimsh

Review URL: https://codereview.chromium.org/663093007

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra