Replace const-value arguments where const-ref intended.

This is a re-split of a previously split CL.

This is of concern when passing vectors and strings, as unintended
(and often expensive) copies occur under the covers.

Apply some of the following (depending on split):
-- Make non-const and move in callee where appropriate.
-- Convert to string_view where appropriate.
-- Avoid stray const in a few places

This CL was uploaded by git cl split.

R=kenrb@chromium.org

Bug: 369952985
Change-Id: I143974322cbe2a8d921b59da780087f03e1eb78d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5914457
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1365679}