Forward --no-sandbox flag, if present, to LoadAndLaunch platform app tests.

Forward --no-sandbox flag, if present, to LoadAndLaunch platform app tests.

This flag was being discarded if it was set on the command line, causing
problems for ASAN tests on windows.

BUG=449588
Committed: https://crrev.com/fa1651193bf94120b61abb1a7f987ded6556caeb
Cr-Commit-Position: refs/heads/master@{#312161}

[benwells, 2015-01-19 23:32:13]

benwells@chromium.org changed reviewers:
+ jackhou@chromium.org

[jackhou1, 2015-01-20 04:07:58]

lgtm

[benwells, 2015-01-20 04:08:50]

The CQ bit was checked by benwells@chromium.org

[commit-bot: I haz the power, 2015-01-20 04:09:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/859683004/1

[commit-bot: I haz the power, 2015-01-20 04:13:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-20 04:14:26]

Patchset 1 (id:??) landed as
https://crrev.com/fa1651193bf94120b61abb1a7f987ded6556caeb
Cr-Commit-Position: refs/heads/master@{#312161}