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If Abseil is compiled with -fexceptions ABSL_HAVE_EXCEPTIONS will be
defined and Abseil will be able to throw. Since exceptions are
forbidden in Chromium's code, this CL removes the possibility to
enable them.

Abseil automatically sets ABSL_HAVE_EXCEPTIONS here:
https://cs.chromium.org/chromium/src/third_party/abseil-cpp/absl/base/config.h?l=207&rcl=f4f0f0e2af28098ac58f8548b13d1a1f46d7c846

Bug: webrtc:8821
Change-Id: I82e19abbe62f332173d977b5ea93f9040232572b
Reviewed-on: https://chromium-review.googlesource.com/1012074Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550614}