MacViews: All targets compile. Fixes unit_tests and message_center_unittests

MacViews: All targets compile. Fixes unit_tests and message_center_unittests

This mainly involves adjusting chrome_tests_unit.gypi to exclude
chrome's unit_tests that use views UI not enabled by default with
toolkit-views=1 on Mac.

Mostly the unit tests compile, but fail to link since their
corresponding UI parts are not in the browser.
(confirm_bubble_views_unittest.cc has a simple compile fix, but isn't
linked in yet).

An events_test_support dependency is needed in views_test_support for
ui/events/test/event_generator which some unit tests use, and otherwise
comes in through aura_test_support or views_unittests.

BUG=412234, 399191
Committed: https://crrev.com/a9dbe443abce6efe81df9a32b65731fb22f07652
Cr-Commit-Position: refs/heads/master@{#294047}

[tapted, 2014-09-09 09:15:57]

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

[tapted, 2014-09-09 09:19:24]

Hi sky, please take a look.

[sky, 2014-09-09 15:50:58]

LGTM

[tapted, 2014-09-09 23:14:59]

The CQ bit was checked by tapted@chromium.org

[commit-bot: I haz the power, 2014-09-09 23:25:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tapted@chromium.org/507373002/100001

[commit-bot: I haz the power, 2014-09-10 00:13:44]

Committed patchset #6 (id:100001) as 94e10eb2911fd93fecff4e9d6ac09d30fce53b87

[commit-bot: I haz the power, 2014-09-10 03:56:51]

Patchset 6 (id:??) landed as
https://crrev.com/a9dbe443abce6efe81df9a32b65731fb22f07652
Cr-Commit-Position: refs/heads/master@{#294047}