in rtp_rtcp module:
  fixed build/namespaces lint errors
  fixed readability/namespace lint errors

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

Review URL: https://codereview.webrtc.org/1506823002

Cr-Commit-Position: refs/heads/master@{#10978}
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_utility.cc b/webrtc/modules/rtp_rtcp/source/rtcp_utility.cc
index eb44a87..e194996 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_utility.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_utility.cc
@@ -41,8 +41,8 @@
 
 uint32_t MidNtp(uint32_t ntp_sec, uint32_t ntp_frac) {
   return (ntp_sec << 16) + (ntp_frac >> 16);
-}  // end RTCPUtility
 }
+}  // namespace RTCPUtility
 
 // RTCPParserV2 : currently read only
 RTCPUtility::RTCPParserV2::RTCPParserV2(const uint8_t* rtcpData,