Allow a tad more race-induced histogram errors

Allow a tad more race-induced histogram errors

When the sum of the buckets is "significantly" different from a second counter, which is incremented when any bucket is bumped, then we declare the histogram to be potentially "spammed."  The limit was a difference by 1, but examination of the UMA uploads shows that for some histograms, this can grow larger.  This CL increases the threshold from "as much as 1 away" to "as much as 5 away."

r=rtenneti

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=148997

[ramant (doing other things), 2012-07-30 17:32:02]

lgtm

[commit-bot: I haz the power, 2012-07-30 17:46:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jar@chromium.org/10833026/1

[commit-bot: I haz the power, 2012-07-30 19:31:13]

Change committed as 148997