It used to be that immortal immovable objects have to be on the first page to
not be moved. This is no longer true since we flag pages wrt whether they are
allowed to move.

R=mlippautz@chromium.org

Change-Id: I5c9c88fa358636df119108e16e871815b126ab27
Reviewed-on: https://chromium-review.googlesource.com/575976Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46777}