Replace RefCountImpl with rtc::RefCountedObject.

webrtc/test/vcm_capturer.cc

Index: webrtc/test/vcm_capturer.cc
diff --git a/webrtc/test/vcm_capturer.cc b/webrtc/test/vcm_capturer.cc
index 0a82236c9880487968c147938ecca7c8b83f26f9..792b97ff0883f7157a9f11f9cff622a9885b23b3 100644
--- a/webrtc/test/vcm_capturer.cc
+++ b/webrtc/test/vcm_capturer.cc
@@ -79,17 +79,13 @@ void VcmCapturer::Stop() {
 }
 
 void VcmCapturer::Destroy() {
-  if (vcm_ == NULL) {
+  if (!vcm_)
     return;
-  }
 
   vcm_->StopCapture();
   vcm_->DeRegisterCaptureDataCallback();
-  vcm_->Release();
-
-  // TODO(pbos): How do I destroy the VideoCaptureModule? This still leaves
-  //             non-freed memory.
-  vcm_ = NULL;
+  // Release reference to VCM.
+  vcm_ = nullptr;
 }
 
 VcmCapturer::~VcmCapturer() { Destroy(); }