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I can't reproduce a MemoryError locally or on the try bots, and the original bug only shows MemoryErrors on the top_25 pageset.

Successfult tryjobs:
https://codereview.chromium.org/1086243002/

BUG=463111

Review URL: https://codereview.chromium.org/1097573002

Cr-Commit-Position: refs/heads/master@{#325539}