The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1ea39dc2e5db08297e77e3638e5245bda45284cf

commit 1ea39dc2e5db08297e77e3638e5245bda45284cf
Author: Tibor Goldschwendt <tiborg@chromium.org>
Date: Thu Aug 17 17:24:31 2017

[vr] Fix navigation from New Tab Page

The navigation did not work because we were referencing the new web
contents even though we thought they were the old web contents. Thus,
we bailed out early since it seemed no new setup is necessary.

I reverted back to an earlier state where we held on to the web
contents, in case it was not a native page, instead of the tab. By doing
so, we have the correct references. However, I still want to hold on to
the web contents even if it is native page because I need to pass the
web contents to the tab model in a follow-up change.

Bug:  754816 
Change-Id: Iec410bcb2eb4d000dce795f0f017f7b70abef44c
Reviewed-on: https://chromium-review.googlesource.com/617883
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#495206}
[modify] https://crrev.com/1ea39dc2e5db08297e77e3638e5245bda45284cf/chrome/browser/android/vr_shell/vr_shell.cc
[modify] https://crrev.com/1ea39dc2e5db08297e77e3638e5245bda45284cf/chrome/browser/android/vr_shell/vr_shell.h