Replace most explicit `new RefCountedObject...` with make_ref_counted

Bug: webrtc:12701
Change-Id: Iab91f1e96715eed7f9ddcfe1ca55510a18c817eb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224544
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35786}
diff --git a/examples/unityplugin/simple_peer_connection.cc b/examples/unityplugin/simple_peer_connection.cc
index 34abbe2..16c580e 100644
--- a/examples/unityplugin/simple_peer_connection.cc
+++ b/examples/unityplugin/simple_peer_connection.cc
@@ -99,7 +99,7 @@
     : public webrtc::SetSessionDescriptionObserver {
  public:
   static DummySetSessionDescriptionObserver* Create() {
-    return new rtc::RefCountedObject<DummySetSessionDescriptionObserver>();
+    return rtc::make_ref_counted<DummySetSessionDescriptionObserver>();
   }
   virtual void OnSuccess() { RTC_LOG(LS_INFO) << __FUNCTION__; }
   virtual void OnFailure(webrtc::RTCError error) {
@@ -446,10 +446,9 @@
     RTC_DCHECK(texture_helper != nullptr)
         << "Cannot get the Surface Texture Helper.";
 
-    rtc::scoped_refptr<webrtc::jni::AndroidVideoTrackSource> source(
-        new rtc::RefCountedObject<webrtc::jni::AndroidVideoTrackSource>(
-            g_signaling_thread.get(), env, /* is_screencast= */ false,
-            /* align_timestamps= */ true));
+    auto source = rtc::make_ref_counted<webrtc::jni::AndroidVideoTrackSource>(
+        g_signaling_thread.get(), env, /*is_screencast=*/false,
+        /*align_timestamps=*/true);
 
     // link with VideoCapturer (Camera);
     jmethodID link_camera_method = webrtc::GetStaticMethodID(
diff --git a/examples/unityplugin/unity_plugin_apis.cc b/examples/unityplugin/unity_plugin_apis.cc
index 34c28d9..672330f 100644
--- a/examples/unityplugin/unity_plugin_apis.cc
+++ b/examples/unityplugin/unity_plugin_apis.cc
@@ -27,7 +27,7 @@
                          const char* credential,
                          bool mandatory_receive_video) {
   g_peer_connection_map[g_peer_connection_id] =
-      new rtc::RefCountedObject<SimplePeerConnection>();
+      rtc::make_ref_counted<SimplePeerConnection>();
 
   if (!g_peer_connection_map[g_peer_connection_id]->InitializePeerConnection(
           turn_urls, no_of_urls, username, credential, mandatory_receive_video))