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This CL makes it explicitly clear when we care about whether the page
was listening for activate before pause, and when we should autopresent
on entering VR (for headset insertion).

This also removes the workaround in vr_display_impl that allowed pages
without focus to handle displayActivate, favoring handling this case
more correctly in VrShellDelegate.

Bug: 829513
Change-Id: Ie19c55305d0c59ec3f576010ded0f61ae906a084
Reviewed-on: https://chromium-review.googlesource.com/1004927Reviewed-by: Yash Malik <ymalik@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549736}