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Add a feature flag to encapsulate logic that will persist the crash
restore infobar across navigations.

Bug: 1162312
Change-Id: I70c00d3ebe8d382c4406286da18a49b608c6744e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606625
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839681}