ui: Cleanup class/struct forward declarations

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 6ba4692dc50731cea117bb01d69160c8c368ab68..fa0554e154e3f25267087156f56fb245056f6f6f 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
@@ -49,6 +49,11 @@ class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
   // Returns true if it should block the auto hide behavior of the shelf.
   bool ShouldBlockShelfAutoHide() const;
 
+  // Returns true if the menu should show emoji, handwriting and voice buttons
+  // on the bottom. Otherwise, the menu will show a 'Customize...' bottom row
+  // for non-MD UI, and a Settings button in the title row for MD.
+  bool ShouldShowEmojiHandwritingVoiceButtons() const;
+
   // TrayBackgroundView:
   void SetShelfAlignment(ShelfAlignment alignment) override;
   base::string16 GetAccessibleNameForTray() override;