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This change moves the library features std::reference_wrapper, std::ref
and std::cref from the to be discussed section to the allowed section,
adds further documentation and links to the cxx@ discussion thread.

Furthermore, it removes base::internal::ConstRefWrapper and modifies
base::ConstRef to construct std::reference_wrappers instead.

As a follow up to this change all usages of base::ConstRef should be
replaced by std::cref, and base::ConstRef should be removed as well.

Bug: 934808
Change-Id: Ie09884c38049a0f69bb3cb6442907c699e29da2e
Reviewed-on: https://chromium-review.googlesource.com/c/1482958
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635481}