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Shrinks expanded page.h size by ~2.1M.

Change-Id: I20c304f7c2a47e86a14dfecd792f0b9b4da35531
Reviewed-on: https://chromium-review.googlesource.com/1204131Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#589191}