Remove AudioDeviceObserver and make ADM not inherit from the Module interface.

media/engine/webrtcvoiceengine_unittest.cc

 /*
  *  Copyright (c) 2008 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.
  */
 
@@ skipping 3320 matching lines @@
       call.get(), cricket::MediaConfig(), cricket::AudioOptions());
   EXPECT_TRUE(channel != nullptr);
   delete channel;
 }
 
 // Tests that reference counting on the external ADM is correct.
 TEST(WebRtcVoiceEngineTest, StartupShutdownWithExternalADM) {
   testing::NiceMock<webrtc::test::MockAudioDeviceModule> adm;
   EXPECT_CALL(adm, AddRef()).Times(3).WillRepeatedly(Return(0));
   EXPECT_CALL(adm, Release()).Times(3).WillRepeatedly(Return(0));
-  // Return 100ms just in case this function gets called.  If we don't,
-  // we could enter a tight loop since the mock would return 0.
-  EXPECT_CALL(adm, TimeUntilNextProcess()).WillRepeatedly(Return(100));
   {
     rtc::scoped_refptr<webrtc::AudioProcessing> apm =
         webrtc::AudioProcessing::Create();
     cricket::WebRtcVoiceEngine engine(
         &adm, webrtc::MockAudioEncoderFactory::CreateUnusedFactory(),
         webrtc::MockAudioDecoderFactory::CreateUnusedFactory(), nullptr, apm);
     engine.Init();
     webrtc::RtcEventLogNullImpl event_log;
     std::unique_ptr<webrtc::Call> call(
         webrtc::Call::Create(webrtc::Call::Config(&event_log)));
@@ skipping 176 matching lines @@
   // Without this cast, the comparison turned unsigned and, thus, failed for -1.
   const int num_specs = static_cast<int>(specs.size());
   EXPECT_GE(find_codec({"cn", 8000, 1}), num_specs);
   EXPECT_GE(find_codec({"cn", 16000, 1}), num_specs);
   EXPECT_EQ(find_codec({"cn", 32000, 1}), -1);
   EXPECT_GE(find_codec({"telephone-event", 8000, 1}), num_specs);
   EXPECT_GE(find_codec({"telephone-event", 16000, 1}), num_specs);
   EXPECT_GE(find_codec({"telephone-event", 32000, 1}), num_specs);
   EXPECT_GE(find_codec({"telephone-event", 48000, 1}), num_specs);
 }