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This change adds conversion functions between base::StringPiece and
absl::string_view. This is to aid the adoption of other Abseil features,
that make use of the otherwise banned absl::string_view in their public
API.

Fixed: 1113880
Change-Id: Ib038a4e71fb0ce6470304e4151474a5d92809d22
Bug: 1113880
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2345306
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796501}