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|ChromeWebContentsHandler::AddNewContents| assumed that a browser object
can be created in all situations but this is not true, at least if the
request comes during browser shutdown.

|ChromeWebContentsHandler::AddNewContents| is updated to consider the
case that browser cannot be created and gracefully exit.

Bug: 1141608, 1121894
Change-Id: Iaf0b2b4c1359ccf9b3b07ed606521a62c98ea4e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513209
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823517}