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In particular, make GetNormalizedHeader() and RemoveHeader() and take
StringPieces. Both are already calling StringPiece-friendly methods
internally, so this should reduce copies slightly.

Also make a number of methods take a "base::StringPiece" instead of
a "const base::StringPiece&".

Bug: 1068194
Change-Id: I7a27d505a8f5c20ddb5c1313b9de4f2cb1069dec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149690
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Auto-Submit: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759391}