Remove dead VP8SequenceCoder.

Remove dead VP8SequenceCoder.

BUG=webrtc:7349
R=marpan@google.com, marpan@webrtc.org

Review-Url: https://codereview.webrtc.org/2753763004 .
Cr-Commit-Position: refs/heads/master@{#17261}
Committed: https://chromium.googlesource.com/external/webrtc/+/14dc089fb00dd727e02c1a388c2581ec63af07d3

[pbos-webrtc, 2017-03-15 16:59:55]

Dead/unreferenced, PTAL.

[pbos-webrtc, 2017-03-15 17:14:34]

Description was changed from

==========
Remove unused VP8SequenceCoder.

BUG=webrtc:7349
R=marpan@webrtc.org
==========

to

==========
Remove dead VP8SequenceCoder.

BUG=webrtc:7349
R=marpan@webrtc.org
==========

[marpan, 2017-03-15 17:52:18]

marpan@google.com changed reviewers:
+ marpan@google.com

[marpan, 2017-03-15 17:52:19]

lgtm

[pbos-webrtc, 2017-03-15 17:53:19]

Description was changed from

==========
Remove dead VP8SequenceCoder.

BUG=webrtc:7349
R=marpan@webrtc.org
==========

to

==========
Remove dead VP8SequenceCoder.

BUG=webrtc:7349
R=marpan@google.com, marpan@webrtc.org

Review-Url: https://codereview.webrtc.org/2753763004 .
Cr-Commit-Position: refs/heads/master@{#17261}
Committed:
https://chromium.googlesource.com/external/webrtc/+/14dc089fb00dd727e02c1a388...
==========

[pbos-webrtc, 2017-03-15 17:53:20]

Committed patchset #1 (id:1) manually as
14dc089fb00dd727e02c1a388c2581ec63af07d3 (presubmit successful).