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Migrates Mac app shim support and security key remoting code away
from internal EDK APIs and over to newer, functionally equivalent
public APIs.

No functional changes here, just swapping out old types for new ones
and updating dependencies appropriately.

Note that this also duplicates some internal EDK code into the public
Mojo platform library. This code is shared by a few unrelated
parts of Chrome and really has nothing to do with Mojo, but there's
not a better home for it yet.

Bug: 844763
Change-Id: I40e7ff08f01d513fb046dc636ba3e4b1db1dbad2
Reviewed-on: https://chromium-review.googlesource.com/1099726
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567330}