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This change cleans up some baggage left over from the original splitting of UI out
of the common VR codebase, and makes native module work easier.

BUG=

Change-Id: I6c2935a4986023963a2cbc9535a97858016c30c9
Reviewed-on: https://chromium-review.googlesource.com/c/1393463Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619473}