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This CL only handles a difficult case in //net. The easy cases were
tackled by mechanical CLs, such as https://crrev.com/c/1188959 for
//net. Parallel CLs will tackle other difficult cases.

ability to reason about instance ownership locally, creating instances
via base::MakeRefCounted makes it possible to use 1-based ref-counting
in the future (see base/memory/ref_counted.h).

net: :IOBuffer is (thread-safe) ref-counted. Asides from improving the
Change-Id: I9925444170fcb8ab3740c1a1223c10c5d4060775
Reviewed-on: https://chromium-review.googlesource.com/1215465Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590268}