Fix target arch for x86 bots.

Fix target arch for x86 bots.

The target_arch should be ia32 for x86 builders. This is causing the x86 try and
fyi bots to fail during runhooks because it doesnt match a case in common.gypi.

BUG=359644
TBR=cmp@chromium.org

Committed: https://crrev.com/99fa5464cb1b1ba9af0dee4438f182de5c0847ea
Cr-Commit-Position: refs/heads/master@{#295644}

[navabi, 2014-09-18 22:44:28]

navabi@google.com changed reviewers:
+ aurimas@chromium.org, luqui@chromium.org, thakis@chomium.org, zty@chromium.org

[Nico, 2014-09-18 22:51:59]

thakis@chromium.org changed reviewers:
+ thakis@chromium.org

[Nico, 2014-09-18 22:52:00]

lgtm

[aurimas (slooooooooow), 2014-09-19 00:28:53]

LGTM

[aurimas (slooooooooow), 2014-09-19 00:59:43]

The CQ bit was checked by aurimas@chromium.org

[aurimas (slooooooooow), 2014-09-19 00:59:49]

The CQ bit was unchecked by aurimas@chromium.org

[aurimas (slooooooooow), 2014-09-19 01:00:07]

The CQ bit was checked by aurimas@chromium.org

[commit-bot: I haz the power, 2014-09-19 01:01:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/581173004/1

[commit-bot: I haz the power, 2014-09-19 01:13:59]

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

[commit-bot: I haz the power, 2014-09-19 01:14:00]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[aurimas (slooooooooow), 2014-09-19 01:17:45]

aurimas@chromium.org changed reviewers:
+ craigdh@chromium.org

[aurimas (slooooooooow), 2014-09-19 01:17:45]

craigdh@chromium.org OWNERS review.

[navabi, 2014-09-19 02:34:54]

craigdh is gone as is every single other OWNER besides myself. We should add
jbudorick to OWNERS.

[navabi, 2014-09-19 02:35:05]

The CQ bit was checked by navabi@google.com

[commit-bot: I haz the power, 2014-09-19 02:35:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/581173004/1

[commit-bot: I haz the power, 2014-09-19 02:40:40]

Committed patchset #1 (id:1) as bcc15d0896b34f3199a9852c8c373ccef8687a33

[commit-bot: I haz the power, 2014-09-19 02:41:41]

Patchset 1 (id:??) landed as
https://crrev.com/99fa5464cb1b1ba9af0dee4438f182de5c0847ea
Cr-Commit-Position: refs/heads/master@{#295644}