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For enabling UMA uploads on cellular networks upload interval should be increased to 15min instead of 5min which according to initial experiments showed to decrease average overall size of the upload.

This behavior is enabled for users which are assigned to Finch experiment.

BUG=455847

Review URL: https://codereview.chromium.org/922383003

Cr-Commit-Position: refs/heads/master@{#317654}