update _estimated_stddev for speedometer2

This updates _estimated_stddev for speedometer2.
The value is collected by running speedometer2 on kevin
and samus to get the maximum stddev/mean.

BUG=chromium:849321
TEST=None

Change-Id: If5efa962451a4f221eef4c33a408e88c7d3fee43
Reviewed-on: https://chromium-review.googlesource.com/1087347
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
1 file changed