diff --git a/pc/videocapturertracksource.cc b/pc/videocapturertracksource.cc
index 2bb29da..2c64b42 100644
--- a/pc/videocapturertracksource.cc
+++ b/pc/videocapturertracksource.cc
@@ -382,10 +382,14 @@
     cricket::VideoCapturer* capturer,
     cricket::CaptureState capture_state) {
   if (rtc::Thread::Current() != signaling_thread_) {
+    // Use rtc::Unretained, because we don't want this to capture a reference
+    // to ourselves. If our destructor is called while this task is executing,
+    // that's fine; our AsyncInvoker destructor will wait for it to finish if
+    // it isn't simply canceled.
     invoker_.AsyncInvoke<void>(
         RTC_FROM_HERE, signaling_thread_,
-        rtc::Bind(&VideoCapturerTrackSource::OnStateChange, this, capturer,
-                  capture_state));
+        rtc::Bind(&VideoCapturerTrackSource::OnStateChange,
+                  rtc::Unretained(this), capturer, capture_state));
     return;
   }
 
diff --git a/pc/videocapturertracksource.h b/pc/videocapturertracksource.h
index 1a2529b..2477340 100644
--- a/pc/videocapturertracksource.h
+++ b/pc/videocapturertracksource.h
@@ -47,14 +47,10 @@
       std::unique_ptr<cricket::VideoCapturer> capturer,
       bool remote);
 
-  bool is_screencast() const override {
-    return video_capturer_->IsScreencast();
-  }
-  rtc::Optional<bool> needs_denoising() const override {
-    return needs_denoising_;
-  }
+  bool is_screencast() const final { return video_capturer_->IsScreencast(); }
+  rtc::Optional<bool> needs_denoising() const final { return needs_denoising_; }
 
-  bool GetStats(Stats* stats) override;
+  bool GetStats(Stats* stats) final;
 
  protected:
   VideoCapturerTrackSource(rtc::Thread* worker_thread,