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Enables the gcm cipher suites for SRTP by default. Since these ciphersuites
are not the first choice this does not change the default behaviour when
talking to other Chrome instances.

BUG=chromium:713701

Change-Id: I133da5b9fabc4605e557f0b787fe63ffa5c1746a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917095Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#759955}