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This way, callers that have a base::StringPiece[16] can avoid copying
the data into an {std::string, base::String16} just to call
GURL::Resolve().

Change-Id: I0c7d73ac55d102bc0bc39afe36efccc33e938e14
Reviewed-on: https://chromium-review.googlesource.com/1195740Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587673}