Update internal SW codecs to return unique_ptrs

TBR=stefan@webrtc.org

Bug: webrtc:7925
Change-Id: I84239b071a2608d928f09b06809090eec5eafb14
Reviewed-on: https://webrtc-review.googlesource.com/21165
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20650}
diff --git a/test/encoder_settings.cc b/test/encoder_settings.cc
index 673785d..bd700cf 100644
--- a/test/encoder_settings.cc
+++ b/test/encoder_settings.cc
@@ -88,11 +88,11 @@
   decoder.payload_type = encoder_settings.payload_type;
   decoder.payload_name = encoder_settings.payload_name;
   if (encoder_settings.payload_name == "H264") {
-    decoder.decoder = H264Decoder::Create();
+    decoder.decoder = H264Decoder::Create().release();
   } else if (encoder_settings.payload_name == "VP8") {
-    decoder.decoder = VP8Decoder::Create();
+    decoder.decoder = VP8Decoder::Create().release();
   } else if (encoder_settings.payload_name == "VP9") {
-    decoder.decoder = VP9Decoder::Create();
+    decoder.decoder = VP9Decoder::Create().release();
   } else {
     decoder.decoder = new FakeDecoder();
   }