Revert of [Cast] Add back ignored width/height in RtpPayloadParams IDL for Chrome...

Revert of [Cast] Add back ignored width/height in RtpPayloadParams IDL for Chrome 43. (patchset #1 id:1 of https://codereview.chromium.org/1009643002/)

Reason for revert:
As discussed in bug 466357, the plan was to revert this patchset for Chrome 44 and later.  These fields will be gone starting in Chrome 46, assuming this lands within the next couple weeks.

Original issue's description:
> [Cast] Add back ignored width/height in RtpPayloadParams IDL for Chrome 43.
>
> A recent change (https://codereview.chromium.org/973753002/) removed the
> width/height properties from the IDL, but the Google Cast Extension needs
> them to be present until a patch rolls out to all Chrome Canary/Dev/Beta
> users.
>
> BUG=466357
> TBR=finnur@chromium.org
>
> Committed: https://crrev.com/5ba8aa856919269a1a079c376d70480da0c2fc23
> Cr-Commit-Position: refs/heads/master@{#320634}

TBR=finnur@chromium.org
BUG=466357

Review URL: https://codereview.chromium.org/1267073004

Cr-Commit-Position: refs/heads/master@{#341474}