[rtp_rtcp] fixed namespaces lint warnings

webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/modules/rtp_rtcp/test/testAPI/test_api.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "webrtc/test/null_transport.h"
 
-using namespace webrtc;
+namespace webrtc {
 
-namespace webrtc {
 void LoopBackTransport::SetSendModule(RtpRtcp* rtp_rtcp_module,
                                       RTPPayloadRegistry* payload_registry,
                                       RtpReceiver* receiver,
                                       ReceiveStatistics* receive_statistics) {
   rtp_rtcp_module_ = rtp_rtcp_module;
   rtp_payload_registry_ = payload_registry;
   rtp_receiver_ = receiver;
   receive_statistics_ = receive_statistics;
 }
 
@@ skipping 39 matching lines @@
 int32_t TestRtpReceiver::OnReceivedPayloadData(
     const uint8_t* payload_data,
     const size_t payload_size,
     const webrtc::WebRtcRTPHeader* rtp_header) {
   EXPECT_LE(payload_size, sizeof(payload_data_));
   memcpy(payload_data_, payload_data, payload_size);
   memcpy(&rtp_header_, rtp_header, sizeof(rtp_header_));
   payload_size_ = payload_size;
   return 0;
 }
-}  // namespace webrtc
 
 class RtpRtcpAPITest : public ::testing::Test {
  protected:
   RtpRtcpAPITest() : fake_clock_(123456) {
     test_csrcs_.push_back(1234);
     test_csrcs_.push_back(2345);
     test_ssrc_ = 3456;
     test_timestamp_ = 4567;
     test_sequence_number_ = 2345;
   }
@@ skipping 90 matching lines @@
   RTPHeader rtx_header;
   rtx_header.ssrc = kRtxSsrc;
   rtx_header.payloadType = kRtxPayloadType;
   EXPECT_TRUE(rtp_payload_registry_->IsRtx(rtx_header));
   rtx_header.ssrc = 0;
   EXPECT_FALSE(rtp_payload_registry_->IsRtx(rtx_header));
   rtx_header.ssrc = kRtxSsrc;
   rtx_header.payloadType = 0;
   EXPECT_TRUE(rtp_payload_registry_->IsRtx(rtx_header));
 }
+
+}  // namespace webrtc