[Ash] Remove non-MD code from ImeListView and ImeListItemView

ash/common/system/chromeos/ime_menu/ime_menu_tray.h

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray.h
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
index 0c7f13b7b82a3d230b74c4afb17a66f7352631ac..79f21b7c005de92786affb098b87a4c74ca9334b 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
@@ -22,8 +22,10 @@ class Label;
 namespace ash {
 class ImeListView;
 
-// The tray item for IME menu, which shows the detailed view of a null single
-// item.
+// A button in the tray which displays the short name of the currently-activated
+// IME (e.g., 'GB', 'US'). Clicking this button opens the opt-in IME menu,
+// a standalone bubble displaying a list of available IMEs along with buttons
+// for emoji, handwriting, and voice.
 class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
                                public IMEObserver,
                                public views::TrayBubbleView::Delegate,