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Fix a typo that causes sizes.py to fail on Mac.

Bug: 1097180
Change-Id: I5d375aa25d6fe9925b889bbd3ea7b061bd0f7473
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330823
Auto-Submit: John Chen <johnchen@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793647}