Disable all PyAuto instant tests on ChromeOS.
Disable all PyAuto instant tests on ChromeOS.

BUG=chromium-os:14439
TEST=None

Change-Id: Iab663c8eaeea198f9d3d74e8f5f069d678ae9429

Review URL: http://codereview.chromium.org/8513021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@110411 0039d316-1c4b-4281-b951-d872f2087c98

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