Revert of [Cast] Software encoder support for varying video frame sizes.

Revert of [Cast] Software encoder support for varying video frame sizes. (patchset #3 id:60001 of https://codereview.chromium.org/877393003/)

Reason for revert:
Linux MSAN fails with uninit memory access.

Original issue's description:
> [Cast] Software encoder support for varying video frame sizes.
>
> Adds support for automatic on-line reconfiguration of the VP8 software
> encoder whenever the video frame size changes.  libvpx supports
> shrinking frame sizes without tearing down the encoder, but growing
> frames sizes still requires a full tear-down and re-creation.
>
> Most of this change involves adding extensive unit testing to confirm
> media/cast is now capable of handling variable frames sizes end-to-end.
> In addition, the cast_sender_app and cast_receiver_app diagnostic tools
> have been updated.
>
> An upcoming change will eliminate the width and height properties from
> media::cast::VideoSenderConfig, which are both being ignored now.
>
> BUG=451277
>
> Committed: https://crrev.com/dbba1332d2d3c6d03d0e86f5dd72164b38b11442
> Cr-Commit-Position: refs/heads/master@{#314196}

TBR=hubbe@chromium.org,miu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=451277
Committed: https://crrev.com/31bc0e862f93d2d020e2d0eb3b47e2b252e05ff8
Cr-Commit-Position: refs/heads/master@{#314246}

[Lei Zhang, 2015-02-03 02:13:25]

Created Revert of [Cast] Software encoder support for varying video frame sizes.

[commit-bot: I haz the power, 2015-02-03 02:15:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/899583002/1

[commit-bot: I haz the power, 2015-02-03 02:16:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-03 02:17:38]

Patchset 1 (id:??) landed as
https://crrev.com/31bc0e862f93d2d020e2d0eb3b47e2b252e05ff8
Cr-Commit-Position: refs/heads/master@{#314246}