Enables use-machine-stack.html worker test.
Enables use-machine-stack.html worker test.

TBR=domincc

Original review: http://codereview.chromium.org/271069

Enables use-machine-stack.html worker test.

As of WebKit revision 49427 Workers now set an appropriate stack
limit on OS X, so this test can be enabled.

Submitt this patch for Dominic Cooney <dominicc@google.com>

Review URL: http://codereview.chromium.org/271082

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@28913 0039d316-1c4b-4281-b951-d872f2087c98

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