Enable NonValidatingReloadOnNormalReload on variations testing

To expand the field study to Beta channel, enable the feature
on variations testing waterfall.

BUG=612701
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2128783002
Cr-Commit-Position: refs/heads/master@{#404321}
6 files changed