Revert of Add groupid for media devices. Group audio devices.

media/audio/mock_audio_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/mock_audio_manager.h"
 
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "media/base/audio_parameters.h"
 
@@ skipping 74 matching lines @@
 AudioParameters MockAudioManager::GetInputStreamParameters(
     const std::string& device_id) {
   return AudioParameters();
 }
 
 std::string MockAudioManager::GetAssociatedOutputDeviceID(
     const std::string& input_device_id) {
   return std::string();
 }
 
-std::string MockAudioManager::GetGroupIDOutput(const std::string& output_id) {
-  return "";
-}
-
-std::string MockAudioManager::GetGroupIDInput(const std::string& input_id) {
-  return "";
-}
-
 std::unique_ptr<AudioLog> MockAudioManager::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return nullptr;
 }
 
 }  // namespace media.