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The latest beta of 10.15.3 fixed the issue where an XPC service could
not show notifications. This removes the workaround we put in place in
https://crrev.com/c/1883648 for macOS 10.15.3+ but keeps it for earlier
versions of 10.15.

Bug: 1007418
Change-Id: I928dac7366c9e7faee793dd72d282b031e535092
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991637
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730122}