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}

webrtc/modules/rtp_rtcp/source/fec_test_helper.h

@@ -54,6 +54,6 @@ class FrameGenerator {
   uint16_t seq_num_;
   uint32_t timestamp_;
 };
-}
+}  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_