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Undoing the first custom link action (i.e. the action that initializes
custom links) will now uninitialize custom links.
Screencast: https://screencast.googleplex.com/cast/NTM5NDQzOTE1MzM4NTQ3Mnw3MDNkZTY0Yy1hZQ

Bug: 881256
Change-Id: I8d77fef71b581d5b6b81ce369d21afd8eb717c31
Reviewed-on: https://chromium-review.googlesource.com/c/1272137
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599394}