Remove Mac 10.8 x86 Perf expectations

Remove Mac 10.8 x86 Perf expectations

This is one of the problems with the way the RecreateSKPs bot determines which trybots to run: Rather than use a hard-coded list, it figures out which bots have perf expectations and then runs those bots to generate new expectations.  This is problematic when we remove a bot because we have to remove its expectations as well.  This is really not that different from maintaining a hard-coded list...

NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/70f25c1a3f5677ff582399e138a82653a5bfe7c8

[rmistry, 2014-08-06 13:02:23]

LGTM

[borenet, 2014-08-06 13:02:55]

The CQ bit was checked by borenet@google.com

[commit-bot: I haz the power, 2014-08-06 13:03:57]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/borenet@google.com/443093002/1

[commit-bot: I haz the power, 2014-08-06 13:04:05]

Change committed as 70f25c1a3f5677ff582399e138a82653a5bfe7c8

[benchen, 2014-08-06 13:16:09]

The difference is that when we add a bot to run expectations, we don't need to
do anything on a list.
But yes, it's not that much different.
Thanks!

[benchen, 2014-08-06 13:29:51]

Actually, if we remove a bot, we don't want its expectation file to still linger
around (while only removing it from a list elsewhere)
Hopefully the expectation-based triggering will retire in a few months..