Disable ChromeNotifierServiceTest.SetAddedAppIdsTest on GTK.

Disable ChromeNotifierServiceTest.SetAddedAppIdsTest on GTK.

It's failing like so:

[ RUN      ] ChromeNotifierServiceTest.SetAddedAppIdsTest
../../chrome/browser/notifications/sync_notifier/chrome_notifier_service_unittest.cc:712: Failure
Value of: notification_manager()->added_notifications()
  Actual: 1
Expected: static_cast<size_t>(2)
Which is: 2
[  FAILED  ] ChromeNotifierServiceTest.SetAddedAppIdsTest (37 ms)

TBR=petewil@chromium.org
BUG=358031
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260469

[viettrungluu, 2014-03-30 20:57:29]

Committed patchset #1 manually as r260469 (presubmit successful).

[Pete Williamson, 2014-03-31 21:28:25]

lgtm