Replace scoped_ptr with unique_ptr in webrtc/modules/audio_coding/test/

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1695763004

Cr-Commit-Position: refs/heads/master@{#11618}
diff --git a/webrtc/modules/audio_coding/test/PacketLossTest.h b/webrtc/modules/audio_coding/test/PacketLossTest.h
index f3570ae..705fe73 100644
--- a/webrtc/modules/audio_coding/test/PacketLossTest.h
+++ b/webrtc/modules/audio_coding/test/PacketLossTest.h
@@ -11,8 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_CODING_TEST_PACKETLOSSTEST_H_
 #define WEBRTC_MODULES_AUDIO_CODING_TEST_PACKETLOSSTEST_H_
 
+#include <memory>
 #include <string>
-#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/audio_coding/test/EncodeDecodeTest.h"
 
 namespace webrtc {
@@ -55,8 +55,8 @@
   int channels_;
   std::string in_file_name_;
   int sample_rate_hz_;
-  rtc::scoped_ptr<SenderWithFEC> sender_;
-  rtc::scoped_ptr<ReceiverWithPacketLoss> receiver_;
+  std::unique_ptr<SenderWithFEC> sender_;
+  std::unique_ptr<ReceiverWithPacketLoss> receiver_;
   int expected_loss_rate_;
   int actual_loss_rate_;
   int burst_length_;