Get rid of include of page_overlay.h in page.h

Shrink page.h from ~9.16M to ~7.01M.

Change-Id: If7516a607c481637ec12872edd33641df8e5ad95
Reviewed-on: https://chromium-review.googlesource.com/1203835
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#588484}
2 files changed