[ Linux ] Mark media/track/track-cues-cuechange.html and media/track/track-cues-enter-exit.html as slow
https://bugs.webkit.org/show_bug.cgi?id=108876

Patch by Alan Cutter <alancutter@chromium.org> on 2013-02-04
Reviewed by Dirk Pranke.

Tests take ~5.4 seconds to run locally.
Timing out on the EWS bots but passing on the Webkit buildbots.
Marked tests as slow in TestExpectations.

* platform/chromium/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141828 268f45cc-cd09-0410-ab3c-d52691b4dbfc