Remove old VideoFrame::Reset.

Remove old VideoFrame::Reset.

Hopefully all external implementations are updated, I could build
Chromium locally with this patch. This Reset implementation causes (for
some mysterious reason) -WError=overloaded-virtual failures when trying
to build libjingle APKs.

R=guoweis@webrtc.org, magjed@webrtc.org, pthatcher@webrtc.org
BUG=webrtc:2365
Committed: https://crrev.com/b64a32bf25367d3a32a081680cb9f1972e06759a
Cr-Commit-Position: refs/heads/master@{#10352}

[pbos-webrtc, 2015-10-19 13:47:01]

PTAL, magjed@.

pthatcher@ for rubberstamp :)

[magjed_webrtc, 2015-10-20 15:44:21]

lgtm

[pthatcher1, 2015-10-20 20:02:20]

pthatcher@webrtc.org changed reviewers:
+ guoweis@webrtc.org

[pthatcher1, 2015-10-20 20:02:21]

lgtm

Adding guoweis@ since he wrote the TODO to remove it.

[guoweis_webrtc, 2015-10-20 20:21:37]

On 2015/10/20 20:02:21, pthatcher1 wrote:
> lgtm
> 
> Adding guoweis@ since he wrote the TODO to remove it.

lgtm.

[commit-bot: I haz the power, 2015-10-21 09:54:19]

Patchset 1 (id:??) landed as
https://crrev.com/b64a32bf25367d3a32a081680cb9f1972e06759a
Cr-Commit-Position: refs/heads/master@{#10352}

[pbos-webrtc, 2015-10-21 09:54:19]

Committed patchset #1 (id:1) manually as
b64a32bf25367d3a32a081680cb9f1972e06759a (presubmit successful).