message: Make MockPeerConnectionInterface not inherit from RefCountedObject
  Cr-Commit-Position: refs/heads/main@{#36267}
diff: namespace webrtc {
  -class MockPeerConnectionInterface
  - : public rtc::RefCountedObject<webrtc::PeerConnectionInterface> {
  +class MockPeerConnectionInterface : public PeerConnectionInterface {
  public:
  static rtc::scoped_refptr<MockPeerConnectionInterface> Create() {
  return rtc::make_ref_counted<MockPeerConnectionInterface>();
  @@ -199,7 +198,9 @@ class MockPeerConnectionInterface
  MOCK_METHOD(void, Close, (), (override));
  };
  -static_assert(!std::is_abstract<MockPeerConnectionInterface>::value, "");
  +static_assert(!std::is_abstract<
  + rtc::RefCountedObject<MockPeerConnectionInterface>>::value,
  + "");
  } // namespace webrtc
  