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This removes the custom workaround to emulate this behavior.

A unit test is adjusted to reflect the fact that a previously generated API binding
will continue to be returned.

Bug: 653596
Change-Id: Ib158164234e111180a00750ba736cd303be391c0
Reviewed-on: https://chromium-review.googlesource.com/867517
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532186}