ios: Add LOG_FATAL message to inducebrowsercrashforrealz.

This will help to validate check content messages.

Change-Id: I2248b5ae72afca778f27a93991b4e751ec6efb6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3383597


Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#958138}