Replace `new rtc::RefCountedObject` with `rtc::make_ref_counted` in a few files

Bug: webrtc:12701
Change-Id: Ie50225374f811424faf20caf4cf454b2fd1c4dc9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215930
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33818}
diff --git a/call/call_perf_tests.cc b/call/call_perf_tests.cc
index 4cb9766..47d6e90 100644
--- a/call/call_perf_tests.cc
+++ b/call/call_perf_tests.cc
@@ -834,7 +834,7 @@
           bitrate_allocator_factory_.get();
       encoder_config->max_bitrate_bps = 2 * kReconfigureThresholdKbps * 1000;
       encoder_config->video_stream_factory =
-          new rtc::RefCountedObject<VideoStreamFactory>();
+          rtc::make_ref_counted<VideoStreamFactory>();
 
       encoder_config_ = encoder_config->Copy();
     }