Reland "ui: Move ui_unittests.gyp into ui/base."

Reland "ui: Move ui_unittests.gyp into ui/base."

Original description from commit 63e36e6bdaa65d1152dd62f9831128c752bc0408:

ui: Move ui_unittests.gyp into ui/base.

ui_unittests.gyp -> ui_base_tests.gyp (follow gfx_tests.gyp pattern).
ui_unittests_bundle.gypi -> ui/base/ui_base_tests_bundle.gypi
ui_unittests.isolate -> ui_base_tests.isolate

Add a TODO assigned to me to rename ui_unittests target to
ui_base_unittests when buildbot is updated.

It was reverted in commit 6297a2f1e441c46d6f8ca37a3798fe6fbdd6cc4c,
because a test from ui_unittests in ios_dbg_simulator started to
failing.

BUG=331829, 373148, 299841, 103304
TEST=ui_unittests
R=sky@chromium.org,rohitrao@chromium.org

Committed: https://crrev.com/2148b92f9cc676bf2b64dc7e47ef65daac393031
Cr-Commit-Position: refs/heads/master@{#293134}

[sky, 2014-09-02 17:10:57]

Did you change anything?

[tfarina, 2014-09-02 17:15:13]

On 2014/09/02 17:10:57, sky wrote:
> Did you change anything?

Yes. See the diff between patch set 1 and 2.
https://codereview.chromium.org/518423002/diff2/1:20001/ui/base/ui_base_tests...

[sky, 2014-09-02 18:24:04]

LGTM

[rohitrao (ping after 24h), 2014-09-03 12:16:31]

Diff from patchset #1 LGTM.

[tfarina, 2014-09-03 14:00:22]

Pushing to CQ, so I might not be around when this lands.

Please, revert right way if it breaks iOS or anything else.

Thank you both for reviewing this to me.

[tfarina, 2014-09-03 14:00:29]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-09-03 14:01:36]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tfarina@chromium.org/518423002/20001

[commit-bot: I haz the power, 2014-09-03 14:46:50]

Committed patchset #2 (id:20001) as cca5c2c5ced99e2372e840c2b8b154231ec3feb2

[commit-bot: I haz the power, 2014-09-10 03:25:38]

Patchset 2 (id:??) landed as
https://crrev.com/2148b92f9cc676bf2b64dc7e47ef65daac393031
Cr-Commit-Position: refs/heads/master@{#293134}