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This has already been implemented for its Windows counterpart. It is a
simple change for mac to just pass the DMG file path to InstallFromDMG() function.

Bug: 1051763
Change-Id: Ia0858532e9c756210a1b5288bd347bd7dcd055d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065309
Commit-Queue: Colin Pacitti <copacitt@microsoft.com>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745648}