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This change fixes the ranges for
PageLoad.Clients.Ads.Memory.MainFrame.Max and
PageLoad.Clients.Ads.Memory.UpdateCount, which were initially too
small.

This CL also replaces 'bytes' with 'kilobytes' in the histogram
descriptions of the PageLoad.Clients.Ads.Memory.*.Max metrics.

We are not versioning the metrics as this is a bug fix just a couple
days after launch.

Bug: 1136598
Change-Id: I790abcf40d0469469ad519401470bcd09ced59ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462339Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: John Delaney <johnidel@chromium.org>
Commit-Queue: Cammie Smith Barnes <cammie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816780}