The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0d9f6c3d376172588e66b104f9495cdccb149dfd

commit 0d9f6c3d376172588e66b104f9495cdccb149dfd
Author: Rohit Rao <rohitrao@chromium.org>
Date: Tue Jan 22 11:29:35 2019

[ios] Moves session restoration out of the TabModel constructor.

TabModel's constructor used to take a SessionWindow as its first
argument, and it used that to populate the WebStateList with an initial
set of tabs.  The restoration happened at the end of the constructor,
however, making it easy to move the session restoration into another
function.  Callers that used to pass a non-nil SessionWindow now call
-[TabModel restoreSessionWindow:forInitialRestore:] immediately after
construction.

BUG=923476

Change-Id: I89b0406e7c68563a803fbef082fbd2ecf98abdd0
Reviewed-on: https://chromium-review.googlesource.com/c/1422959
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624760}
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/crash_report/crash_restore_helper.mm
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/sessions/session_window_restoring.h
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/tabs/tab_model.h
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/tabs/tab_model.mm
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/tabs/tab_model_list_unittest.mm
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/tabs/tab_model_unittest.mm
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/test/perf_test_with_bvc_ios.mm
[modify] https://crrev.com/0d9f6c3d376172588e66b104f9495cdccb149dfd/ios/chrome/browser/ui/main/browser_view_wrangler.mm