Use fallback in LayoutThemeMobile on mac.

Use fallback in LayoutThemeMobile on mac.

WebThemeEngine does nothing on mac, so we use fallback
to paint radio and checkbox. This only happens when emulating
mobile device on mac.

BUG=591315
Review URL: https://codereview.chromium.org/1837963002

Cr-Commit-Position: refs/heads/master@{#385205}
(cherry picked from commit 9f52d372f849394e43bb2e648750311442a029e3)
TBR=dgozman

Committed: https://chromium.googlesource.com/chromium/src/+/3b3fde3ff83fee5e6980d5a529b45ac370657877

[dgozman, 2016-04-09 00:23:45]

Description was changed from

==========
Use fallback in LayoutThemeMobile on mac.

WebThemeEngine does nothing on mac, so we use fallback
to paint radio and checkbox. This only happens when emulating
mobile device on mac.

BUG=591315

Review URL: https://codereview.chromium.org/1837963002

Cr-Commit-Position: refs/heads/master@{#385205}
(cherry picked from commit 9f52d372f849394e43bb2e648750311442a029e3)
TBR=dgozman
==========

to

==========
Use fallback in LayoutThemeMobile on mac.

WebThemeEngine does nothing on mac, so we use fallback
to paint radio and checkbox. This only happens when emulating
mobile device on mac.

BUG=591315

Review URL: https://codereview.chromium.org/1837963002

Cr-Commit-Position: refs/heads/master@{#385205}
(cherry picked from commit 9f52d372f849394e43bb2e648750311442a029e3)
TBR=dgozman

Committed:
https://chromium.googlesource.com/chromium/src/+/3b3fde3ff83fee5e6980d5a529b4...
==========

[dgozman, 2016-04-09 00:23:46]

Committed patchset #1 (id:1) manually as
3b3fde3ff83fee5e6980d5a529b45ac370657877.