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In https://codereview.chromium.org/2674002, Google code was put into
the third_party/mozilla/NSPasteboard+Utils.h|mm files. This was not
imported code from Mozilla and did not belong there.

This utility code is moved into a Chromium file (with slight
modernization.)

The lawyers have approved this.

BUG=none
TEST=no visible change intended

Change-Id: Icf3a91d10d7d52757b7dd220b2703acf3ff45b4d
Reviewed-on: https://chromium-review.googlesource.com/c/1355525Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612379}