Don't log GPU blackluist stats if GPU blacklist is not loaded.

Don't log GPU blackluist stats if GPU blacklist is not loaded.

BUG=120114
TEST=
R=jbates
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=129257

[Zhenyao Mo, 2012-03-27 18:03:34]

Please have a look.  This CL is to stop ASSERTION failure in debug mode.  I
still need to figure out why GPU blacklist was not loaded in such situation and
fix that, but that will be in a different CL.

[jbates, 2012-03-27 18:13:21]

lgtm

[commit-bot: I haz the power, 2012-03-27 18:14:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zmo@chromium.org/9864046/1

[nduca, 2012-03-27 18:18:12]

lgtm