Have the ui_test_support target be of type none on iOS.

Have the ui_test_support target be of type none on iOS.

After https://chromiumcodereview.appspot.com/16024014, the ui_test_support
target has no sources that are built on iOS. This causes targets that depend on
this target to fail linkage because the ui_test_support library can't be found.

R=thakis

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=206147

[blundell, 2013-06-13 12:45:41]

I assume that the reason that this hasn't caused bot failures (yet) is that they
don't do clean builds.

[Nico, 2013-06-13 15:48:29]

lgtm

Another possible fix would be to have a dummy source file in this target on ios,
which might be less brittle if you expect to have sources in this target at some
point. But this is fine too.

[commit-bot: I haz the power, 2013-06-13 16:28:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/blundell@chromium.org/16841013/1

[commit-bot: I haz the power, 2013-06-13 20:00:13]

Change committed as 206147