Replace the remaining scoped_ptr with unique_ptr in webrtc/modules/

webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
index b48fed6ea252255318e7add87c7d1312a6c3ca82..924d009883d9f7fd70c457ab1f6f8a7444541aed 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -145,7 +147,7 @@ class RtcpReceiverTest : public ::testing::Test {
   TestTransport* test_transport_;
   RTCPHelp::RTCPPacketInformation rtcp_packet_info_;
   MockRemoteBitrateObserver remote_bitrate_observer_;
-  rtc::scoped_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
+  std::unique_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
 };