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The old sizes.py perf test used to check for a whole set of performance
regressions. This is now handled elsewhere with the exception of the SI
check. The SI check is fairly simple, however, and doesn't require all
of the the perf_expectations infrastructure which is now obsolete.

This CL removes the obsolete perf_expectations, hard codes the expected
number of SIs in the script, and removes the windows and android code
as it doesn't actually do anything.

Bug: 572393
Change-Id: I960cb8fec63e25c489e8c4e90f670c7e35dd4fd6
Reviewed-on: https://chromium-review.googlesource.com/654178Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Tim Brown <timbrown@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505434}