GitLab

Replace it with 2 methods:
1- restoreSessionToBrowser
2- addObserversToWebStateList

Bug: 1049335
Change-Id: I7099e8fdfdc023fdd71bde00cd1384213690dd1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040008Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738989}