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Prefer using value-based instead of unique_ptr-based APIs where it is
not too intrusive. Use the new representation to more efficiently
translate list and dictionary values (per the documented
recommendations). Replace CreateWithCopiedBuffer with construction from
a span.

base::PickleIterator was augmented with a span-of-bytes ReadData API, to
make this a little cleaner, since this is now preferred over a pair of a
const char* and length.

Bug: 646113
Change-Id: I6361bfffe65e2d84aa8d50390648bb7ac194f205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241936Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777516}