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recently protobuf added a deprecated annotation to C++ code to warn when
depreacated protobuf fields are in use. To allow continue use of
deprecated fields in C++, a compiler exception was added. This turned
out to be pretty widespread. Will disable for now protobuf deprecated
warnings and remove the extra GN config so that the exception doesn't
need to be present.

Bug: 1151621
Change-Id: I9216c94079f90231f2cea81d9f46b6a39b0037fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553387
Commit-Queue: Andres Medina <medinaandres@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Andres Medina <medinaandres@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830021}