Fix: RefCountInterface: Make AddRef() and Release() const

talk/app/webrtc/dtmfsender_unittest.cc

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 16 matching lines @@
 
 #include "talk/app/webrtc/dtmfsender.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "talk/app/webrtc/audiotrack.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/logging.h"
-#include "webrtc/base/refcount.h"
 #include "webrtc/base/timeutils.h"
 
 using webrtc::AudioTrackInterface;
 using webrtc::AudioTrack;
 using webrtc::DtmfProviderInterface;
 using webrtc::DtmfSender;
 using webrtc::DtmfSenderObserverInterface;
 
 static const char kTestAudioLabel[] = "test_audio_track";
 static const int kMaxWaitMs = 3000;
 
-class FakeDtmfObserver : public DtmfSenderObserverInterface, RefCountInterface {
+class FakeDtmfObserver : public DtmfSenderObserverInterface {
  public:
   FakeDtmfObserver() : completed_(false) {}
 
   // Implements DtmfSenderObserverInterface.
   void OnToneChange(const std::string& tone) override {
     LOG(LS_VERBOSE) << "FakeDtmfObserver::OnToneChange '" << tone << "'.";
     tones_.push_back(tone);
     if (tone.empty()) {
       completed_ = true;
     }
@@ skipping 291 matching lines @@
   std::string tones = "3,4";
   int duration = 100;
   int inter_tone_gap = 50;
 
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, 6001, inter_tone_gap));
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, 69, inter_tone_gap));
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, duration, 49));
 
   EXPECT_TRUE(dtmf_->InsertDtmf(tones, duration, inter_tone_gap));
 }