Mark template class RefCountedObject as final.

pc/webrtcsession_unittest.cc

Index: pc/webrtcsession_unittest.cc
diff --git a/pc/webrtcsession_unittest.cc b/pc/webrtcsession_unittest.cc
index fe0049d33ac70de7f1e319123eba2b281ff3eae9..f389c9e4d644792ca1a607866acff180aef3c020 100644
--- a/pc/webrtcsession_unittest.cc
+++ b/pc/webrtcsession_unittest.cc
@@ -309,7 +309,7 @@ class WebRtcSessionForTest : public webrtc::WebRtcSession {
 };
 
 class WebRtcSessionCreateSDPObserverForTest
-    : public rtc::RefCountedObject<CreateSessionDescriptionObserver> {
+    : public CreateSessionDescriptionObserver {
  public:
   enum State {
     kInit,
@@ -788,8 +788,8 @@ class WebRtcSessionTest
 
   SessionDescriptionInterface* CreateOffer(
       const PeerConnectionInterface::RTCOfferAnswerOptions options) {
-    rtc::scoped_refptr<WebRtcSessionCreateSDPObserverForTest>
-        observer = new WebRtcSessionCreateSDPObserverForTest();
+    rtc::scoped_refptr<WebRtcSessionCreateSDPObserverForTest> observer =
+        new rtc::RefCountedObject<WebRtcSessionCreateSDPObserverForTest>();
     cricket::MediaSessionOptions session_options;
     GetOptionsForOffer(options, &session_options);
     session_->CreateOffer(observer, options, session_options);
@@ -801,8 +801,8 @@ class WebRtcSessionTest
 
   SessionDescriptionInterface* CreateAnswer(
       const cricket::MediaSessionOptions& options) {
-    rtc::scoped_refptr<WebRtcSessionCreateSDPObserverForTest> observer
-        = new WebRtcSessionCreateSDPObserverForTest();
+    rtc::scoped_refptr<WebRtcSessionCreateSDPObserverForTest> observer =
+        new rtc::RefCountedObject<WebRtcSessionCreateSDPObserverForTest>();
     cricket::MediaSessionOptions session_options = options;
     GetOptionsForAnswer(&session_options);
     session_->CreateAnswer(observer, session_options);
@@ -1620,7 +1620,8 @@ class WebRtcSessionTest
     rtc::scoped_refptr<WebRtcSessionCreateSDPObserverForTest>
         observers[kNumber];
     for (int i = 0; i < kNumber; ++i) {
-      observers[i] = new WebRtcSessionCreateSDPObserverForTest();
+      observers[i] =
+          new rtc::RefCountedObject<WebRtcSessionCreateSDPObserverForTest>();
       if (type == CreateSessionDescriptionRequest::kOffer) {
         session_->CreateOffer(observers[i], options, offer_session_options);
       } else {
@@ -4546,7 +4547,7 @@ TEST_F(WebRtcSessionTest, CreateOffersAndShutdown) {
   cricket::MediaSessionOptions session_options;
   GetOptionsForOffer(options, &session_options);
   for (auto& o : observers) {
-    o = new WebRtcSessionCreateSDPObserverForTest();
+    o = new rtc::RefCountedObject<WebRtcSessionCreateSDPObserverForTest>();
     session_->CreateOffer(o, options, session_options);
   }