Revert of Make TrayDetailsView a ViewClickListener and ButtonListener

ash/common/system/chromeos/audio/audio_detailed_view.cc

Index: ash/common/system/chromeos/audio/audio_detailed_view.cc
diff --git a/ash/common/system/chromeos/audio/audio_detailed_view.cc b/ash/common/system/chromeos/audio/audio_detailed_view.cc
index 85858b90236403b5f6246bea1603fc90a99769d7..8c8dd74c9282cfc8ce8dc00fca467ef947874866 100644
--- a/ash/common/system/chromeos/audio/audio_detailed_view.cc
+++ b/ash/common/system/chromeos/audio/audio_detailed_view.cc
@@ -98,9 +98,13 @@
   return container;
 }
 
+void AudioDetailedView::CreateHeaderEntry() {
+  CreateSpecialRow(IDS_ASH_STATUS_TRAY_AUDIO, this);
+}
+
 void AudioDetailedView::CreateItems() {
   CreateScrollableList();
-  CreateTitleRow(IDS_ASH_STATUS_TRAY_AUDIO);
+  CreateHeaderEntry();
 }
 
 void AudioDetailedView::UpdateAudioDevices() {
@@ -150,13 +154,17 @@
   scroller()->Layout();
 }
 
-void AudioDetailedView::HandleViewClicked(views::View* view) {
-  AudioDeviceMap::iterator iter = device_map_.find(view);
-  if (iter == device_map_.end())
-    return;
-  chromeos::AudioDevice device = iter->second;
-  CrasAudioHandler::Get()->SwitchToDevice(device, true,
-                                          CrasAudioHandler::ACTIVATE_BY_USER);
+void AudioDetailedView::OnViewClicked(views::View* sender) {
+  if (sender == footer()->content()) {
+    TransitionToDefaultView();
+  } else {
+    AudioDeviceMap::iterator iter = device_map_.find(sender);
+    if (iter == device_map_.end())
+      return;
+    chromeos::AudioDevice device = iter->second;
+    CrasAudioHandler::Get()->SwitchToDevice(device, true,
+                                            CrasAudioHandler::ACTIVATE_BY_USER);
+  }
 }
 
 }  // namespace tray