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Microsoft Edge is now available for download on macOS:
https://www.microsoft.com/en-us/edge

Add it to the list of preset browsers, so admins can set
AlternativeBrowserPath to ${edge} if they want to bounce users to Edge.

Also, fix an issue where Chrome tabs wouldn't close after bouncing to
the alternative browser. This affects Linux and macOS only.

Bug: 1124758
Change-Id: I71d18edd7dd9cd83fdd5602be2a41eb9d0ae56a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601338Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839106}