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With this commit, StartClientCertificateRequest null-checks the
ViewAndroidHelper, ViewAndroid, and WindowAndroid pointers before
dereferencing them.

This is a speculative fix for the attached bug.

Bug: 1048855
Change-Id: Ibb677fe94238428fa6f31b375fc327336dcb1d8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039893
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738723}