Make rtcp parsing implementation private in RtcpReceiver

Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
R=sprang@webrtc.org

Committed: https://crrev.com/faf708e238c7b43a732fbebf79ac9298b4b95a95
Cr-Commit-Position: refs/heads/master@{#14181}

[danilchap, 2016-09-08 07:33:47]

Description was changed from

==========
In RtcpReceiver make parsing implementation private:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
==========

to

==========
Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
==========

[danilchap, 2016-09-08 07:34:45]

danilchap@webrtc.org changed reviewers:
+ sprang@webrtc.org

[sprang_webrtc, 2016-09-12 07:56:02]

lgtm

[danilchap, 2016-09-12 08:31:26]

Description was changed from

==========
Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
==========

to

==========
Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
R=sprang@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/faf708e238c7b43a732fbebf7...
==========

[commit-bot: I haz the power, 2016-09-12 08:31:29]

Description was changed from

==========
Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
R=sprang@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/faf708e238c7b43a732fbebf7...
==========

to

==========
Make rtcp parsing implementation private in RtcpReceiver:
Function just for Parse and for Callbacks moved to private section.
All handles moved from protected to private section.

BUG=webrtc:5260
R=sprang@webrtc.org

Committed: https://crrev.com/faf708e238c7b43a732fbebf79ac9298b4b95a95
Cr-Commit-Position: refs/heads/master@{#14181}
==========

[danilchap, 2016-09-12 08:31:31]

Committed patchset #1 (id:1) manually as
faf708e238c7b43a732fbebf79ac9298b4b95a95 (presubmit successful).

[danilchap, 2016-09-12 08:40:26]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2332673003/ by danilchap@webrtc.org.

The reason for reverting is: Breaks fuzzer compilation..