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This reverts commit 239e5b82.

> 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

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_chromium_archive_rel_ng;luci.chromium.try:mac_chromium_archive_rel_ng;luci.chromium.try:win_archive;luci.chromium.try:win_x64_archive;master.tryserver.chromium.android:android_archive_rel_ng
TBR=dpranke

Bug: 572393
Change-Id: Iad25e02aba593632f167bb534be95ba6a5691446
Reviewed-on: https://chromium-review.googlesource.com/1241935Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594389}