Revert of Use RC_TIMESTAMP_MODE for OpenH264.

Revert of Use RC_TIMESTAMP_MODE for OpenH264. (patchset #1 id:1 of https://codereview.webrtc.org/1945763002/ )

Reason for revert:
Previous mode aligns with other encoders, and RC_TIMESTAMP_MODE might have issues with no frames for several seconds.

Original issue's description:
> Use RC_TIMESTAMP_MODE for OpenH264.
>
> Performs rate control based on timestamp deltas instead of announced
> frame rate.
>
> BUG=webrtc:5855
> R=hbos@webrtc.org
>
> Committed: https://crrev.com/c4deee49a3ec42b7fe83c82f750539b36aae1d3f
> Cr-Commit-Position: refs/heads/master@{#12611}

TBR=hbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5855
Committed: https://crrev.com/b49ac78c71d3dfa24a8a3877ca800c9593a484ee
Cr-Commit-Position: refs/heads/master@{#12629}

[pbos-webrtc, 2016-05-04 14:17:44]

Created Revert of Use RC_TIMESTAMP_MODE for OpenH264.

[commit-bot: I haz the power, 2016-05-04 14:17:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1950973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1950973002/1

[commit-bot: I haz the power, 2016-05-04 14:17:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-04 14:18:07]

Description was changed from

==========
Revert of Use RC_TIMESTAMP_MODE for OpenH264. (patchset #1 id:1 of
https://codereview.webrtc.org/1945763002/ )

Reason for revert:
Previous mode aligns with other encoders, and RC_TIMESTAMP_MODE might have
issues with no frames for several seconds.

Original issue's description:
> Use RC_TIMESTAMP_MODE for OpenH264.
> 
> Performs rate control based on timestamp deltas instead of announced
> frame rate.
> 
> BUG=webrtc:5855
> R=hbos@webrtc.org
> 
> Committed: https://crrev.com/c4deee49a3ec42b7fe83c82f750539b36aae1d3f
> Cr-Commit-Position: refs/heads/master@{#12611}

TBR=hbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5855
==========

to

==========
Revert of Use RC_TIMESTAMP_MODE for OpenH264. (patchset #1 id:1 of
https://codereview.webrtc.org/1945763002/ )

Reason for revert:
Previous mode aligns with other encoders, and RC_TIMESTAMP_MODE might have
issues with no frames for several seconds.

Original issue's description:
> Use RC_TIMESTAMP_MODE for OpenH264.
>
> Performs rate control based on timestamp deltas instead of announced
> frame rate.
>
> BUG=webrtc:5855
> R=hbos@webrtc.org
>
> Committed: https://crrev.com/c4deee49a3ec42b7fe83c82f750539b36aae1d3f
> Cr-Commit-Position: refs/heads/master@{#12611}

TBR=hbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5855

Committed: https://crrev.com/b49ac78c71d3dfa24a8a3877ca800c9593a484ee
Cr-Commit-Position: refs/heads/master@{#12629}
==========

[commit-bot: I haz the power, 2016-05-04 14:18:07]

Patchset 1 (id:??) landed as
https://crrev.com/b49ac78c71d3dfa24a8a3877ca800c9593a484ee
Cr-Commit-Position: refs/heads/master@{#12629}