Disable FirstRunMasterPrefsWithTrackedPreferences.TrackedPreferencesSurviveFirstRun on Chrome+Mac

See issue 314221, it appears the problem wasn't import tests which are disabled in the same way, but their underlying framework (Mac browser_tests appear to hang when forced to go through first run).

BUG=342427,314221

Review URL: https://codereview.chromium.org/159093003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250246 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250246