Start PowerUsageMonitor unconditionally from UMA bit.
Start PowerUsageMonitor unconditionally from UMA bit.

As PowerUsageMonitor is only reporting UMA data and nothing else, then PowerUsageMonitor can be started without checking UMA bit. The existing metrics service will take care of not uploading the data if The UMA bit is off.

Currently the check is there so that PowerUsageMonitor is not uselessly working in cases when the data will not be uploaded anyway. However in general we prefer to avoid such checks because enabling UMA shouldn't give users 'slower' Chrome.

BUG=600398

Review URL: https://codereview.chromium.org/1855223003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#385183}

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