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This change adds a C++14 backport of C++17's std::not_fn to
base/functional.

Bug: None
Change-Id: Ib441a7210e9992786c2dc241438dc8ea538ef73e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498486
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822128}