Remove Observer methods in RTCVideoEncoderFactory.

Remove Observer methods in RTCVideoEncoderFactory.

These methods are no-ops in the current implementations and are going
away in the upstream interface, where a default implementation is
provided in the interrim.

R=tommi@chromium.org
BUG=webrtc:3876
Committed: https://crrev.com/6650ccfc57f15543efdba8eaab758b6f2071f32b
Cr-Commit-Position: refs/heads/master@{#299089}

[pbos, 2014-10-09 13:40:25]

On 2014/10/09 13:40:12, pbos wrote:

Ptal, and if lgtm please cq. :)

[tommi (sloooow) - chröme, 2014-10-09 13:54:50]

The CQ bit was checked by tommi@chromium.org

[tommi (sloooow) - chröme, 2014-10-09 13:54:50]

lgtm

[commit-bot: I haz the power, 2014-10-09 13:55:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/639393002/1

[commit-bot: I haz the power, 2014-10-09 15:30:50]

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

[commit-bot: I haz the power, 2014-10-09 15:30:51]

Failed to commit the patch.

[commit-bot: I haz the power, 2014-10-09 15:32:03]

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

[tommi (sloooow) - chröme, 2014-10-10 11:06:10]

The CQ bit was checked by tommi@chromium.org

[commit-bot: I haz the power, 2014-10-10 11:07:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/639393002/1

[commit-bot: I haz the power, 2014-10-10 11:08:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 11:08:52]

Patchset 1 (id:??) landed as
https://crrev.com/6650ccfc57f15543efdba8eaab758b6f2071f32b
Cr-Commit-Position: refs/heads/master@{#299089}