Move SrtpSession and tests to their own files.

Move SrtpSession and tests to their own files.

BUG=None

Review-Url: https://codereview.webrtc.org/2976443002
Cr-Commit-Position: refs/heads/master@{#18935}
Committed: https://chromium.googlesource.com/external/webrtc/+/4dde3df3b5ac205b77dab67ad28802ae1ed834ba

[Zach Stein, 2017-07-06 22:51:39]

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

[Taylor Brandstetter, 2017-07-07 19:18:26]

Description was changed from

==========
Move SrtpSession and tests to their own files.

BUG=
==========

to

==========
Move SrtpSession and tests to their own files.

BUG=None
==========

[Taylor Brandstetter, 2017-07-07 19:19:08]

lgtm

[Zach Stein, 2017-07-07 20:29:22]

The CQ bit was checked by zstein@webrtc.org

[commit-bot: I haz the power, 2017-07-07 20:29:37]

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, 2017-07-07 21:26:26]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499459362562970, "parent_rev":
"7d0a77eef431748f26cacee140bef3b36cc9bc22", "commit_rev":
"4dde3df3b5ac205b77dab67ad28802ae1ed834ba"}

[commit-bot: I haz the power, 2017-07-07 21:26:30]

Description was changed from

==========
Move SrtpSession and tests to their own files.

BUG=None
==========

to

==========
Move SrtpSession and tests to their own files.

BUG=None

Review-Url: https://codereview.webrtc.org/2976443002
Cr-Commit-Position: refs/heads/master@{#18935}
Committed:
https://chromium.googlesource.com/external/webrtc/+/4dde3df3b5ac205b77dab67ad...
==========

[commit-bot: I haz the power, 2017-07-07 21:26:31]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/4dde3df3b5ac205b77dab67ad...