lint whitespace warning removed from most rtp_rtcp/source/ files

rtcp_utility, rtp_utility, tmmbr_help, rtcp_receiver, rtcp_receiver_help are explicetly excluded from the cleanup becaues there are short plans (or cls) to do a deeper cleaning there.

BUG=webrtc:5277
R=pbos@webrtc.org, mflodman@webrtc.org

Review URL: https://codereview.webrtc.org/1512493002

Cr-Commit-Position: refs/heads/master@{#10966}

webrtc/modules/rtp_rtcp/source/rtcp_packet.h

@@ -361,7 +361,6 @@ class Nack : public RtcpPacket {
   size_t BlockLength() const override;
 
  private:
-
   RTCPUtility::RTCPPacketRTPFBNACK nack_;
   std::vector<RTCPUtility::RTCPPacketRTPFBNACKItem> nack_fields_;