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This CL separates resources of oobe.html and md_login.html, so that
they could be cleaned separately.

Bug: 926638
Change-Id: I71708cd7e07e872d80245d77524c7920482979a7
Reviewed-on: https://chromium-review.googlesource.com/c/1455636Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630556}