Disable testing for MetricsReportingEnabled policy on ChromeOS.
Disable testing for MetricsReportingEnabled policy on ChromeOS.

BUG=chromium-os:121066
TEST=policy.py
TBR=craigdh@chromium.org

Change-Id: I3e00eac0d4bf48db0930b0d5f5f95066e6ad2ee6

Review URL: https://chromiumcodereview.appspot.com/9958040

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@130002 0039d316-1c4b-4281-b951-d872f2087c98

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