Remove the VoEDtmf interface.

webrtc/voice_engine/test/auto_test/fixtures/after_streaming_fixture.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef SRC_VOICE_ENGINE_MAIN_TEST_AUTO_TEST_STANDARD_AFTER_STREAMING_H_
 #define SRC_VOICE_ENGINE_MAIN_TEST_AUTO_TEST_STANDARD_AFTER_STREAMING_H_
 
+#include <memory>
+
+#include "webrtc/voice_engine/channel_proxy.h"
 #include "webrtc/voice_engine/test/auto_test/fixtures/before_streaming_fixture.h"
 
 // This fixture will, in addition to the work done by its superclasses,
 // start play back on construction.
 class AfterStreamingFixture : public BeforeStreamingFixture {
  public:
   AfterStreamingFixture();
   virtual ~AfterStreamingFixture() {}
+
+ protected:
+  std::unique_ptr<webrtc::voe::ChannelProxy> channel_proxy_;
 };
 
 #endif  // SRC_VOICE_ENGINE_MAIN_TEST_AUTO_TEST_STANDARD_AFTER_STREAMING_H_