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/opus_test.h b/webrtc/modules/audio_coding/test/opus_test.h
index 93c9ffb..ce570f6 100644
--- a/webrtc/modules/audio_coding/test/opus_test.h
+++ b/webrtc/modules/audio_coding/test/opus_test.h
@@ -13,7 +13,8 @@
 
 #include <math.h>
 
-#include "webrtc/base/scoped_ptr.h"
+#include <memory>
+
 #include "webrtc/modules/audio_coding/codecs/opus/opus_interface.h"
 #include "webrtc/modules/audio_coding/acm2/acm_resampler.h"
 #include "webrtc/modules/audio_coding/test/ACMTest.h"
@@ -39,7 +40,7 @@
 
   void OpenOutFile(int test_number);
 
-  rtc::scoped_ptr<AudioCodingModule> acm_receiver_;
+  std::unique_ptr<AudioCodingModule> acm_receiver_;
   TestPackStereo* channel_a2b_;
   PCMFile in_file_stereo_;
   PCMFile in_file_mono_;