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These are not supposed to be widely used per the style guide, and aren't
necessary where we're using them. Also const&& makes no sense.

Bug: none
Test: compile
Change-Id: Id16a193d6dfbeee109a1bd6ade61800afbe07574
Reviewed-on: https://chromium-review.googlesource.com/1118976
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572245}