Update test expectations to reflect a newly crashing webkit test.
Update test expectations to reflect a newly crashing webkit test.

fast/js/excessive-comma-usage.html is crashing on webkit-linux bots since r52309.

TEST=greens the bots
BUG=49099

Review URL: http://codereview.chromium.org/2934020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@52396 0039d316-1c4b-4281-b951-d872f2087c98

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