Let PacketSource::NextPacket() return an std::unique_ptr

webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h

Index: webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h
diff --git a/webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h b/webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h
index 938e39e2e69a5d3fcb2a34cf91080a432d2ad7c7..c752878186cdf1606045de3bd6622b8b0e72c6dc 100644
--- a/webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h
+++ b/webrtc/modules/audio_coding/acm2/acm_send_test_oldapi.h
@@ -44,10 +44,8 @@ class AcmSendTestOldApi : public AudioPacketizationCallback,
   // Registers an external send codec. Returns true on success, false otherwise.
   bool RegisterExternalCodec(AudioEncoder* external_speech_encoder);
 
-  // Returns the next encoded packet. Returns NULL if the test duration was
-  // exceeded. Ownership of the packet is handed over to the caller.
   // Inherited from PacketSource.
-  Packet* NextPacket() override;
+  std::unique_ptr<Packet> NextPacket() override;
 
   // Inherited from AudioPacketizationCallback.
   int32_t SendData(FrameType frame_type,
@@ -63,9 +61,8 @@ class AcmSendTestOldApi : public AudioPacketizationCallback,
   static const int kBlockSizeMs = 10;
 
   // Creates a Packet object from the last packet produced by ACM (and received
-  // through the SendData method as a callback). Ownership of the new Packet
-  // object is transferred to the caller.
-  Packet* CreatePacket();
+  // through the SendData method as a callback).
+  std::unique_ptr<Packet> CreatePacket();
 
   SimulatedClock clock_;
   std::unique_ptr<AudioCodingModule> acm_;