[Mac, Linux] Add People in the menu bar should automatically create a default profile

[Mac, Linux] Add People in the menu bar should automatically create a default profile

This will make it have the same behaviour as the User Manager, vs. navigating to
chrome://settings/createProfile.

BUG=452125
TEST=Choose Add Person from the OS menu bar. This should create a profile and
switch to it immediately.

Committed: https://crrev.com/f13cd124b647cb47ac25e2eaefe6a49f7e1a651f
Cr-Commit-Position: refs/heads/master@{#313586}

[noms (inactive), 2015-01-28 16:08:22]

noms@chromium.org changed reviewers:
+ asvitkine@chromium.org, sky@chromium.org

[noms (inactive), 2015-01-28 16:08:23]

Hi,

This CL changes the behaviour of the "Add Person" OS menu option to match that
of the User Manager. Please take a look. Thanks!

scott: c/b/ui/views
alexei: c/b/ui/cocoa

[Alexei Svitkine (slow), 2015-01-28 16:10:08]

lgtm

[sky, 2015-01-28 21:10:24]

views LGTM

[noms (inactive), 2015-01-28 21:11:48]

The CQ bit was checked by noms@chromium.org

[commit-bot: I haz the power, 2015-01-28 21:12:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870203003/1

[commit-bot: I haz the power, 2015-01-28 21:26:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-28 21:28:54]

Patchset 1 (id:??) landed as
https://crrev.com/f13cd124b647cb47ac25e2eaefe6a49f7e1a651f
Cr-Commit-Position: refs/heads/master@{#313586}