GitLab

Workaround for null context was necessary on iOS 12
as confirmed by Navigation.IOSNullContextInDidFailProvisionalNavigation
histogram. Also stop recording Navigation.IOSNullContextInDidFailProvisionalNavigation
as this histogram has expired and served its purpose.

Bug: None
Change-Id: Id2df18c8e92c134049a820b6a38af403c38bac6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638447
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845902}