Update test/ to not use implicit conversion from scoped_refptr<T> to T*.

Bug: webrtc:13464
Change-Id: I55750dc842adf0d854bbc45e593c0e251064f9d6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/259771
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36623}
diff --git a/test/mappable_native_buffer.cc b/test/mappable_native_buffer.cc
index 48b9379..1b171e6 100644
--- a/test/mappable_native_buffer.cc
+++ b/test/mappable_native_buffer.cc
@@ -163,7 +163,7 @@
     case VideoFrameBuffer::Type::kI420: {
       rtc::scoped_refptr<I420Buffer> i420_buffer =
           I420Buffer::Create(width, height);
-      I420Buffer::SetBlack(i420_buffer);
+      I420Buffer::SetBlack(i420_buffer.get());
       mapped_buffer = i420_buffer;
       break;
     }