Update WebUILogin Focus for Mash

Update WebUILogin Focus for Mash

There is no ash::Shell instance when running in mash, the new focus code
in WebUILogin does not work. Exit early in newly added code to allow for
login to not crash while running in mash.

TEST=manual
BUG=647039
Committed: https://crrev.com/2c5fa0e91fb3fcd0b480856104a793ca3219cca1
Cr-Commit-Position: refs/heads/master@{#419855}

[jonross, 2016-09-20 20:39:11]

jonross@chromium.org changed reviewers:
+ sky@chromium.org

[jonross, 2016-09-20 20:39:12]

Hey sky@,

jamescook@ is seeing a crash in login, this addresses it. Could you provide an
owners review?

Thanks,
Jon

[jonross, 2016-09-20 20:39:14]

Hey sky@,

jamescook@ is seeing a crash in login, this addresses it. Could you provide an
owners review?

Thanks,
Jon

[xiyuan, 2016-09-20 20:54:01]

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

[xiyuan, 2016-09-20 20:54:02]

lgtm

Thanks for taking care of it.

[jonross, 2016-09-20 20:56:03]

The CQ bit was checked by jonross@chromium.org

[commit-bot: I haz the power, 2016-09-20 20:56:41]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-20 21:20:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-20 21:22:04]

Description was changed from

==========
Update WebUILogin Focus for Mash

There is no ash::Shell instance when running in mash, the new focus code
in WebUILogin does not work. Exit early in newly added code to allow for
login to not crash while running in mash.

TEST=manual
BUG=647039
==========

to

==========
Update WebUILogin Focus for Mash

There is no ash::Shell instance when running in mash, the new focus code
in WebUILogin does not work. Exit early in newly added code to allow for
login to not crash while running in mash.

TEST=manual
BUG=647039

Committed: https://crrev.com/2c5fa0e91fb3fcd0b480856104a793ca3219cca1
Cr-Commit-Position: refs/heads/master@{#419855}
==========

[commit-bot: I haz the power, 2016-09-20 21:22:05]

Patchset 1 (id:??) landed as
https://crrev.com/2c5fa0e91fb3fcd0b480856104a793ca3219cca1
Cr-Commit-Position: refs/heads/master@{#419855}