Temporarily disable stack trace tests, pending investigation on XP bots

Temporarily disable stack trace tests, pending investigation on XP bots

R=rmsousa@chromium.org
TBR=beaudoin, binjin, kaliamoorthi, noms, rmsousa
BUG=461160
Committed: https://chromium.googlesource.com/chromium/src/+/941e4f2044c6ccce85b2efc6b5c254978ff9d754

[scottmg, 2015-02-24 01:43:17]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-02-24 01:44:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/949953004/1

[rmsousa, 2015-02-24 01:48:40]

lgtm

[commit-bot: I haz the power, 2015-02-24 01:50:51]

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

[commit-bot: I haz the power, 2015-02-24 01:50:51]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[commit-bot: I haz the power, 2015-02-24 01:53:37]

Patchset 1 (id:??) landed as
https://crrev.com/941e4f2044c6ccce85b2efc6b5c254978ff9d754
Cr-Commit-Position: refs/heads/master@{#317732}

[scottmg, 2015-02-24 01:53:52]

Committed patchset #1 (id:1) manually as
941e4f2044c6ccce85b2efc6b5c254978ff9d754 (presubmit successful).