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Originally landed https://chromium-review.googlesource.com/1031211

This CL makes types more explicit for literal -> stringpiece conversions.

TBR=sky@chromium.org

Bug: 833419
Change-Id: I3c08259906076216da22623b54d18e269b075bd0
Reviewed-on: https://chromium-review.googlesource.com/1033448Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554811}