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This reverts commit 5994cc70.

Reason for revert:
Broke sizes step
https://ci.chromium.org/p/chrome/builders/ci/win-google-rel/3728

Original change's description:
> Add sizes.py isolated_script to chromium.chrome bots. (RELAND)
> 
> This is a reland of crrev.com/c/1604471
> 
> Bug: 961548
> Change-Id: I3cf8d892f0f5f3dad43751dbcc78031ed52ac616
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1607102
> Auto-Submit: John Budorick <jbudorick@chromium.org>
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#659047}

TBR=agrieve@chromium.org,bpastene@chromium.org,jbudorick@chromium.org

Change-Id: Ib49d27c6a9fcc13b391b395a34c672b19f56dc57
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 961548
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610519Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659103}