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

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index 7d3c946ab179221bd42e7525e0ecf3cc77b5c8b3..bfca277e7312dcf4bfafbe188d953659876009a8 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -345,28 +345,6 @@
   return "";
 }
 
-std::string AudioManagerBase::GetGroupIDOutput(
-    const std::string& output_device_id) {
-  if (output_device_id == AudioDeviceDescription::kDefaultDeviceId) {
-    std::string real_device_id = GetDefaultOutputDeviceID();
-    if (!real_device_id.empty()) {
-      return real_device_id;
-    }
-  }
-  return output_device_id;
-}
-
-std::string AudioManagerBase::GetGroupIDInput(
-    const std::string& input_device_id) {
-  std::string output_device_id = GetAssociatedOutputDeviceID(input_device_id);
-  if (output_device_id.empty()) {
-    // Some characters are added to avoid accidentally
-    // giving the input the same group id as an output.
-    return input_device_id + "input";
-  }
-  return GetGroupIDOutput(output_device_id);
-}
-
 std::string AudioManagerBase::GetDefaultOutputDeviceID() {
   return "";
 }