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Also, reduce file size from 8MB to 4MB because that's what is reported
by the most recent metrics indicate.  And remove a block of obsolete
code doing an unnecessary disk access.

Bug: 896394
Change-Id: I8830fce2f467044550d5f01597ae5d1a998689f4
Reviewed-on: https://chromium-review.googlesource.com/c/1294293Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602352}