1. To make the files conform to chromium-style guidelines, and stop the compiler from complaing:
1.1. Move constructors out of .h file.
1.2. Move destructors out of .h file.
1.3. Move virtual functions out of .h file.
2. BlockLength() and Create() did not have consistent access modifiers in the various subclasses of RtcpPacket. Change the access level to public throughout.
3. Reorder BlockLength() and Create() where necessary, to reflect the order defined in the parent class (RtcpPacket).
BUG=None
Review-Url: https://codereview.webrtc.org/2937403002
Cr-Commit-Position: refs/heads/master@{#18633}
for consistency with other rtcp packet classes.
BUG=webrtc:5260
Review-Url: https://codereview.webrtc.org/2361853002
Cr-Commit-Position: refs/heads/master@{#14648}
Created rtcp::Psfb abstract class between rtcp::Pli and rtcp::RtcpPacket to hold common data for Feedback Message.
BUG=webrtc:5260
Review URL: https://codereview.webrtc.org/1446513002
Cr-Commit-Position: refs/heads/master@{#10823}
