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This CL is part of new UMA upload logic. The change is for getting more usage data for Chrome users who exclusively use wireless networks. For that, a new binary on/off-switch is added instead of previous three-option model. However, the upload logic is changed on Android to reduce the data usage.

The new binary switch is also connected to a different pref then previous switch. For the beginning the new settings UI would be enabled for users assigned to experimental group.

BUG=455847

Review URL: https://codereview.chromium.org/978623002

Cr-Commit-Position: refs/heads/master@{#321575}