Reason for revert: Fix backward compatibility support Original issue's description: > Revert of Unify rtcp packet setters (patchset #8 id:130001 of https://codereview.webrtc.org/2348623003/ ) > > Reason for revert: > Breaks compilation of internal downstream project. > > Original issue's description: > > Unify rtcp packet setters > > Renamed setters in rtcp classes > > from WithField to SetField > > from WithItem to AddItem or SetItems > > from From to SetSenderSsrc > > from To to SetMediaSsrc > > Some redundant or unsued setters removed. > > Pass-by-const& replaced with pass-by-value when appropriate. > > > > BUG=webrtc:5260 > > > > Committed: https://crrev.com/20e77c7b8a9f19942ef3c3c4f1fa3888b2cd54ea > > Cr-Commit-Position: refs/heads/master@{#14393} > > TBR=sprang@webrtc.org,stefan@webrtc.org,danilchap@webrtc.org > # Skipping CQ checks because original CL landed less than 1 days ago. > NOPRESUBMIT=true > NOTREECHECKS=true > NOTRY=true > BUG=webrtc:5260 > > Committed: https://crrev.com/efc6e41866662e0922858fbce1d9ee3bdd0637ed > Cr-Commit-Position: refs/heads/master@{#14400} TBR=sprang@webrtc.org,stefan@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:5260 Review-Url: https://codereview.webrtc.org/2370313002 Cr-Commit-Position: refs/heads/master@{#14402}