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This histogram is not defined in histograms.xml and is not being used.

Bug: 643561
Change-Id: Ib85c40e3f5df88df51caba61f9888e887219ee83
Reviewed-on: https://chromium-review.googlesource.com/1055951Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Chris Bentzel <cbentzel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558036}