Add CryptoParams to webrtc::MediaSession.

Add CryptoParams to webrtc::MediaSession.

SrtpTransportInterface methods take cricket::CryptoParams, so this
should be enough for now.

BUG=webrtc:7311
Review-Url: https://codereview.webrtc.org/2753343002
Cr-Commit-Position: refs/heads/master@{#17299}
Committed: https://chromium.googlesource.com/external/webrtc/+/7aeabd081f148e489d1e9d360c3fe7587a92b606

[Taylor Brandstetter, 2017-03-17 23:50:39]

deadbeef@webrtc.org changed reviewers:
+ deadbeef@webrtc.org

[Taylor Brandstetter, 2017-03-17 23:50:40]

lgtm. I guess this ended up being simpler than I thought; I wasn't sure at the
time if we'd end up using CryptoParams.

[Zach Stein, 2017-03-17 23:58:43]

The CQ bit was checked by zstein@webrtc.org

[commit-bot: I haz the power, 2017-03-17 23:58:48]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-03-18 02:10:37]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1489795123060600,
"parent_rev": "3eba2d82737932660aae18fe4ad169414a3c3313", "commit_rev":
"7aeabd081f148e489d1e9d360c3fe7587a92b606"}

[commit-bot: I haz the power, 2017-03-18 02:10:44]

Description was changed from

==========
Add CryptoParams to webrtc::MediaSession.

SrtpTransportInterface methods take cricket::CryptoParams, so this
should be enough for now.

BUG=webrtc:7311
==========

to

==========
Add CryptoParams to webrtc::MediaSession.

SrtpTransportInterface methods take cricket::CryptoParams, so this
should be enough for now.

BUG=webrtc:7311

Review-Url: https://codereview.webrtc.org/2753343002
Cr-Commit-Position: refs/heads/master@{#17299}
Committed:
https://chromium.googlesource.com/external/webrtc/+/7aeabd081f148e489d1e9d360...
==========

[commit-bot: I haz the power, 2017-03-18 02:10:45]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/webrtc/+/7aeabd081f148e489d1e9d360...