fix sudo redirection in setup script

fix sudo redirection in setup script

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/149366e884747769b4b2cb810e5d8f328164cf23

[humper, 2014-10-02 17:00:58]

The CQ bit was checked by humper@google.com

[humper, 2014-10-02 17:01:12]

humper@google.com changed reviewers:
+ jcgregorio@google.com

[humper, 2014-10-02 17:01:17]

ptal

[commit-bot: I haz the power, 2014-10-02 17:01:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/618013004/1

[commit-bot: I haz the power, 2014-10-02 17:01:45]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-10-02 23:01 UTC

[humper, 2014-10-02 17:08:55]

humper@google.com changed reviewers:
+ mtklein@google.com

[humper, 2014-10-02 17:09:05]

+mtklein

[mtklein, 2014-10-02 17:23:25]

lgtm

[commit-bot: I haz the power, 2014-10-02 17:37:03]

Committed patchset #1 (id:1) as 149366e884747769b4b2cb810e5d8f328164cf23