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It is no longer necessary to split the interface like this anymore
because we no longer use build flags to control public headers.

Change-Id: I1214850f799f8f73dec96103a264c8f2440ab6ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154026
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759913}