Remove MediaStream renderer from the webapp.

Remove MediaStream renderer from the webapp.

MediaSource is no longer used in the webapp and there is
no plan to use it in the future.

Committed: https://crrev.com/4eb828fabcbb094b45c2e4d0d845b0749dc5f7b9
Cr-Commit-Position: refs/heads/master@{#309606}

[Sergey Ulanov, 2014-12-24 00:27:30]

sergeyu@chromium.org changed reviewers:
+ garykac@chromium.org

[garykac, 2014-12-24 01:20:09]

The CQ bit was checked by garykac@chromium.org

[garykac, 2014-12-24 01:20:09]

lgtm

[commit-bot: I haz the power, 2014-12-24 01:21:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/825793002/1

[commit-bot: I haz the power, 2014-12-24 02:21:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-24 02:22:27]

Patchset 1 (id:??) landed as
https://crrev.com/4eb828fabcbb094b45c2e4d0d845b0749dc5f7b9
Cr-Commit-Position: refs/heads/master@{#309606}