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predictor, based on the following two options:
- not on cellular
- predictive actions are disabled for the current network selection
This allows to only gather stats for a the subset of people we are interested
in (eg only people on cellular, or only people who have prefetch enabled for
the current network condition)
R=jkarlin@chromium.org
TBR=bnc@chromium.org, zhenw@chromium.org

Review URL: https://codereview.chromium.org/591313005

Cr-Commit-Position: refs/heads/master@{#296730}