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

pc/test/fakeaudiocapturemodule_unittest.cc

 /*
  *  Copyright 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.
  */
 
@@ skipping 115 matching lines @@
   rtc::CriticalSection crit_;
 
   int push_iterations_;
   int pull_iterations_;
 
   char rec_buffer_[FakeAudioCaptureModule::kNumberSamples *
                    FakeAudioCaptureModule::kNumberBytesPerSample];
   size_t rec_buffer_bytes_;
 };
 
-TEST_F(FakeAdmTest, TestProcess) {
-  // Next process call must be some time in the future (or now).
-  EXPECT_LE(0, fake_audio_capture_module_->TimeUntilNextProcess());
-  // Process call updates TimeUntilNextProcess() but there are no guarantees on
-  // timing so just check that Process can be called successfully.
-  fake_audio_capture_module_->Process();
-}
-
 TEST_F(FakeAdmTest, PlayoutTest) {
   EXPECT_EQ(0, fake_audio_capture_module_->RegisterAudioCallback(this));
 
   bool stereo_available = false;
   EXPECT_EQ(0,
             fake_audio_capture_module_->StereoPlayoutIsAvailable(
                 &stereo_available));
   EXPECT_TRUE(stereo_available);
 
   EXPECT_NE(0, fake_audio_capture_module_->StartPlayout());
@@ skipping 50 matching lines @@
 
   EXPECT_EQ(0, fake_audio_capture_module_->InitRecording());
   EXPECT_EQ(0, fake_audio_capture_module_->StartRecording());
 
   EXPECT_TRUE_WAIT(push_iterations() > 0, kMsInSecond);
   EXPECT_TRUE_WAIT(pull_iterations() > 0, kMsInSecond);
 
   EXPECT_EQ(0, fake_audio_capture_module_->StopPlayout());
   EXPECT_EQ(0, fake_audio_capture_module_->StopRecording());
 }