Reduce probability of field trial, and extend duration
Reduce probability of field trial, and extend duration

When running in stable channel, we need much lower rates,
so I've reduced test groups from 10% per group, to 0.1%
per group.

I've extended duration so I'll be able to look at results
in the stable channel over time.

r=rtenneti
bug=15479
Review URL: http://codereview.chromium.org/6969015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@84873 0039d316-1c4b-4281-b951-d872f2087c98

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