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This new UMA will replace
DataReductionProxy.SavingsCleared.NegativeSystemClock and add on more
enum values for all the possible reasons the data savings could have
been cleared. This will be done in a follow up CL.

Bug: 812922
Change-Id: Ibc82d187045444b6ca7812e2fc2097549501c0aa
Reviewed-on: https://chromium-review.googlesource.com/1024880
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553725}