[NaCl SDK] Temporarily disable host testing of pi_generator

[NaCl SDK] Temporarily disable host testing of pi_generator

Running this example is consistently failing under host mac
build and occasionally failing on linux as well.

CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_nacl_sdk;tryserver.chromium.mac:mac_nacl_sdk
BUG=475255
Committed: https://crrev.com/2ba251cb5e44c1785748006025119c61b93d84d0
Cr-Commit-Position: refs/heads/master@{#324361}

[Sam Clegg, 2015-04-08 22:31:42]

sbc@chromium.org changed reviewers:
+ binji@chromium.org

[binji, 2015-04-08 23:01:02]

lgtm

[Sam Clegg, 2015-04-08 23:25:33]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-04-08 23:26:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1076573004/1

[commit-bot: I haz the power, 2015-04-08 23:26:57]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-08 23:26:58]

Transient error: Too many
"tryserver.chromium.linux:linux_nacl_sdk,tryserver.chromium.mac:mac_nacl_sdk"
delimiters in ":".
Correct syntax is "tryserver:bot1,bot2;tryserver2:bot3,bot4;".

[Sam Clegg, 2015-04-08 23:31:41]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-04-08 23:32:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1076573004/1

[commit-bot: I haz the power, 2015-04-09 04:01:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-09 04:02:32]

Patchset 1 (id:??) landed as
https://crrev.com/2ba251cb5e44c1785748006025119c61b93d84d0
Cr-Commit-Position: refs/heads/master@{#324361}