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1. Creating a CFDictionary with null callbacks is almost certainly
not something you want to do. It is not bridgeable with NSDictionary,
and the normal semantics of retain/release do not apply. It is
*unsafe* to put autoreleased items into such a dictionary.
There is no guarantee that the items won't be deallocated out from
underneath the dictionary.

2. CFDictionarySetValue does *not* take ownership. No matter if
the dictionary has retain/release semantics or not, assuming
ownership takeover will leak.

Bug: none
Change-Id: I6e3cae093e61ab2a42af7b0052231d00fa4a71b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391208Reviewed-by: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804583}