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This reverts commit 341bb752.

Reason for revert: This broke the CQ.  See:
https://ci.chromium.org/p/chromium/builders/try/win-libfuzzer-asan-rel/472138?
https://ci.chromium.org/p/chromium/builders/try/linux_chromium_tsan_rel_ng/604561?
etc.

Main builders also look to be failing.

Original change's description:
> [Nearby Share] Add ToDictionary, FromDictionary to PrivateCertificate
> 
> ToDictionary and FromDictionary methods convert to/from a Value
> dictionary to facilitate storing PrivateCertificates in Prefs.
> 
> Change-Id: I92117836af94cd224eeea34edc7dd55dd3eb7484
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284043
> Reviewed-by: Josh Nohle <nohle@chromium.org>
> Commit-Queue: Curt Clemens <cclem@google.com>
> Cr-Commit-Position: refs/heads/master@{#786027}

TBR=nohle@chromium.org,cclem@google.com

Change-Id: I3a840d2bcdc09ff8ac6db1926a1a7339e121ca04
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2286470Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786109}