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

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1694423002

Cr-Commit-Position: refs/heads/master@{#11653}
diff --git a/webrtc/modules/audio_processing/test/protobuf_utils.h b/webrtc/modules/audio_processing/test/protobuf_utils.h
index 406f128..3ab90b7 100644
--- a/webrtc/modules/audio_processing/test/protobuf_utils.h
+++ b/webrtc/modules/audio_processing/test/protobuf_utils.h
@@ -11,14 +11,15 @@
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_TEST_PROTOBUF_UTILS_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_TEST_PROTOBUF_UTILS_H_
 
-#include "webrtc/base/scoped_ptr.h"
+#include <memory>
+
 #include "webrtc/modules/audio_processing/debug.pb.h"
 
 namespace webrtc {
 
-// Allocates new memory in the scoped_ptr to fit the raw message and returns the
+// Allocates new memory in the unique_ptr to fit the raw message and returns the
 // number of bytes read.
-size_t ReadMessageBytesFromFile(FILE* file, rtc::scoped_ptr<uint8_t[]>* bytes);
+size_t ReadMessageBytesFromFile(FILE* file, std::unique_ptr<uint8_t[]>* bytes);
 
 // Returns true on success, false on error or end-of-file.
 bool ReadMessageFromFile(FILE* file, ::google::protobuf::MessageLite* msg);