Add armv7s to the iOS ARCH list

Add armv7s to the iOS ARCH list

App Store rules require shipping armv7s with arm64, so this is required
for the "both" configuration.

Also adds it to the 32-bit configuration so that local testing will
better match actual builds, but we can revisit if that turns out to be
onerous in practice.

BUG=407295
Committed: https://crrev.com/f1dc118635a18587a35b3d6f5092878467c261dd
Cr-Commit-Position: refs/heads/master@{#291930}

[stuartmorgan, 2014-08-26 14:47:34]

stuartmorgan@chromium.org changed reviewers:
+ blundell@chromium.org

[blundell, 2014-08-26 14:49:00]

lgtm

[stuartmorgan, 2014-08-26 15:25:59]

The CQ bit was checked by stuartmorgan@chromium.org

[commit-bot: I haz the power, 2014-08-26 15:26:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/stuartmorgan@chromium.org/489713003/1

[commit-bot: I haz the power, 2014-08-26 16:30:26]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)
  win_chromium_rel_swarming on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[commit-bot: I haz the power, 2014-08-26 17:53:52]

Committed patchset #1 (1) as a85d67257a701d61444c71b6d4d9cb5760d1e141

[commit-bot: I haz the power, 2014-09-10 02:43:43]

Patchset 1 (id:??) landed as
https://crrev.com/f1dc118635a18587a35b3d6f5092878467c261dd
Cr-Commit-Position: refs/heads/master@{#291930}