cros system menu - fix back and settings buttons in IME detailed view.

ash/common/system/tray/tray_details_view.h

Index: ash/common/system/tray/tray_details_view.h
diff --git a/ash/common/system/tray/tray_details_view.h b/ash/common/system/tray/tray_details_view.h
index 8a8dd5283efb5adf21068b21b8ef67b29f69bfea..98b2614dfb16b8dd5e7ec4eeb7605044cff4e07d 100644
--- a/ash/common/system/tray/tray_details_view.h
+++ b/ash/common/system/tray/tray_details_view.h
@@ -34,10 +34,12 @@ class ASH_EXPORT TrayDetailsView : public views::View,
   ~TrayDetailsView() override;
 
   // ViewClickListener:
-  void OnViewClicked(views::View* sender) override;
+  // Don't override this --- override HandleViewClicked.
+  void OnViewClicked(views::View* sender) final;
 
   // views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
+  // Don't override this --- override HandleButtonPressed.
+  void ButtonPressed(views::Button* sender, const ui::Event& event) final;
 
   SystemTrayItem* owner() { return owner_; }
   SpecialPopupRow* title_row() { return title_row_; }