Add suppression for AutofillMetrics leak.
Add suppression for AutofillMetrics leak.

This might be an expected leak from UMA histograms, but the stack trace doesn't quite look like it.  Needs investigation.

BUG=79794
TEST=none

Review URL: http://codereview.chromium.org/6877018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@82005 0039d316-1c4b-4281-b951-d872f2087c98

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