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This number was last updated in 2012.  The numbers here are based on the last
week of Windows stable data, taking the mean across all samples.  Other desktop
platforms have higher means than Windows, so this is still aggressive compared
to what we could do.

The expectation is that this change should reduce the total number of renderer
processes we create, and result in reducing the total renderer memory footprint.

Bug: 22546
Change-Id: I2308759644ed2720e4904052e93b37d6ee8367fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772641
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690943}