[Cast] Add back ignored width/height in RtpPayloadParams IDL for Chrome 43.

[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}

[miu, 2015-03-13 22:38:24]

miu@chromium.org changed reviewers:
+ finnur@chromium.org

[miu, 2015-03-13 22:39:47]

finnur: PTAL.  Bug describes issue in more detail.  tl;dr: Temporarily putting
two properties back in the IDL and will remove them again (for good) in about 6
weeks.

[miu, 2015-03-14 01:33:44]

On 2015/03/13 22:39:47, miu wrote:
> finnur: PTAL.  Bug describes issue in more detail.  tl;dr: Temporarily putting
> two properties back in the IDL and will remove them again (for good) in about
6
> weeks.

Going to commit as TBR now, as this trivial change is blocking our testing team.
 Happy to make another change if there are any follow-up issues.

[miu, 2015-03-14 01:33:50]

The CQ bit was checked by miu@chromium.org

[commit-bot: I haz the power, 2015-03-14 01:34:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1009643002/1

[commit-bot: I haz the power, 2015-03-14 02:23:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-14 02:24:29]

Patchset 1 (id:??) landed as
https://crrev.com/5ba8aa856919269a1a079c376d70480da0c2fc23
Cr-Commit-Position: refs/heads/master@{#320634}

[Finnur, 2015-03-16 15:26:55]

LGTM, especially once the properties are removed for good. :)

[miu, 2015-08-02 00:58:25]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1267073004/ by miu@chromium.org.

The reason for reverting is: 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..