GitLab

We don't use the public version anymore, so we now host
NavigationState in InternalDocumentStateData instead of
DocumentState.

This also fixes a bug where we forgot to clone
InternalDocumentStateData when cloning DocumentState.

TBR=boliu@chromium.org,jochen@chromium.org

Bug: none
Change-Id: Ieeed9a73ed3791c7adcf831eb832c87b20a55bc5
Reviewed-on: https://chromium-review.googlesource.com/1236341
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593253}