DataChannelInterface: Remove default implementation of methods.

DataChannelInterface: Remove default implementation of methods.

This can land as soon as https://codereview.chromium.org/2520033005/ has
landed.

BUG=chromium:654927
Committed: https://crrev.com/c42d37646f8e28a54e628cc68c6c3c3c0bfa68f4
Cr-Commit-Position: refs/heads/master@{#15221}

[hbos, 2016-11-23 16:14:20]

The CQ bit was checked by hbos@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-23 16:14:26]

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

[hbos, 2016-11-23 16:16:39]

hbos@webrtc.org changed reviewers:
+ perkj@webrtc.org

[hbos, 2016-11-23 16:16:39]

Please take a look, perkj.

[commit-bot: I haz the power, 2016-11-23 16:27:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-23 16:27:37]

Dry run: This issue passed the CQ dry run.

[perkj_webrtc, 2016-11-24 08:29:10]

lgtm

[hbos, 2016-11-24 09:16:11]

The CQ bit was checked by hbos@webrtc.org

[commit-bot: I haz the power, 2016-11-24 09:16:16]

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, 2016-11-24 09:17:53]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479978971765880, "parent_rev":
"2fb5a245570f2d6a7dbd964ed3ffe89b4748bb63", "commit_rev":
"2c8a7487109952251121eea1f15db23140e46380"}

[commit-bot: I haz the power, 2016-11-24 09:17:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-24 09:18:10]

Description was changed from

==========
DataChannelInterface: Remove default implementation of methods.

This can land as soon as https://codereview.chromium.org/2520033005/ has
landed.

BUG=chromium:654927
==========

to

==========
DataChannelInterface: Remove default implementation of methods.

This can land as soon as https://codereview.chromium.org/2520033005/ has
landed.

BUG=chromium:654927

Committed: https://crrev.com/c42d37646f8e28a54e628cc68c6c3c3c0bfa68f4
Cr-Commit-Position: refs/heads/master@{#15221}
==========

[commit-bot: I haz the power, 2016-11-24 09:18:11]

Patchset 1 (id:??) landed as
https://crrev.com/c42d37646f8e28a54e628cc68c6c3c3c0bfa68f4
Cr-Commit-Position: refs/heads/master@{#15221}