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The basic codepage converion functions in base, namely, CodepageToUTF16,
CodepageToUTF16, and ConvertToUtf8AndNormalize are now taking
StringPiece as the input type. This allows more flexibility when using
theses interfaces, as well as providing the benefit of avoiding
unnecessary string copies.

Change-Id: I5922bd7cc3236f99fbac9393cba61afd9c475af3
Reviewed-on: https://chromium-review.googlesource.com/c/1349652
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610877}