Revert of Fix chromium-style warnings.

Revert of Fix chromium-style warnings. (patchset #1 id:1 of https://codereview.webrtc.org/2400993002/ )

Reason for revert:
Broke internal project

Original issue's description:
> Fix chromium-style warnings.
>
> Separate the null implementation from rtp_rtcp_defines.h, and follow chromium style guide for virtual functions.
>
> BUG=webrtc:163
>
> Committed: https://crrev.com/509eadd554de6bf938da08071c5d2c2541703134
> Cr-Commit-Position: refs/heads/master@{#14738}

TBR=danilchap@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:163
Committed: https://crrev.com/838cdb3db6a24b9be3a3d2700144197935415463
Cr-Commit-Position: refs/heads/master@{#14750}

[terelius, 2016-10-24 16:38:10]

The CQ bit was checked by terelius@webrtc.org

[terelius, 2016-10-24 16:38:11]

Created Revert of Fix chromium-style warnings.

[commit-bot: I haz the power, 2016-10-24 16:38:16]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-10-24 16:38:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-24 16:50:08]

Description was changed from

==========
Revert of Fix chromium-style warnings. (patchset #1 id:1 of
https://codereview.webrtc.org/2400993002/ )

Reason for revert:
Broke internal project

Original issue's description:
> Fix chromium-style warnings.
> 
> Separate the null implementation from rtp_rtcp_defines.h, and follow chromium
style guide for virtual functions.
> 
> BUG=webrtc:163
> 
> Committed: https://crrev.com/509eadd554de6bf938da08071c5d2c2541703134
> Cr-Commit-Position: refs/heads/master@{#14738}

TBR=danilchap@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:163
==========

to

==========
Revert of Fix chromium-style warnings. (patchset #1 id:1 of
https://codereview.webrtc.org/2400993002/ )

Reason for revert:
Broke internal project

Original issue's description:
> Fix chromium-style warnings.
>
> Separate the null implementation from rtp_rtcp_defines.h, and follow chromium
style guide for virtual functions.
>
> BUG=webrtc:163
>
> Committed: https://crrev.com/509eadd554de6bf938da08071c5d2c2541703134
> Cr-Commit-Position: refs/heads/master@{#14738}

TBR=danilchap@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:163

Committed: https://crrev.com/838cdb3db6a24b9be3a3d2700144197935415463
Cr-Commit-Position: refs/heads/master@{#14750}
==========

[commit-bot: I haz the power, 2016-10-24 16:50:09]

Patchset 1 (id:??) landed as
https://crrev.com/838cdb3db6a24b9be3a3d2700144197935415463
Cr-Commit-Position: refs/heads/master@{#14750}