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

ash/common/system/tray/tray_details_view.cc

Index: ash/common/system/tray/tray_details_view.cc
diff --git a/ash/common/system/tray/tray_details_view.cc b/ash/common/system/tray/tray_details_view.cc
index 1b175e0ff56a475006abc50ec626c937471be593..5e26125775a9bc34a1c2da619d3c871a70ca4f21 100644
--- a/ash/common/system/tray/tray_details_view.cc
+++ b/ash/common/system/tray/tray_details_view.cc
@@ -354,10 +354,14 @@ void TrayDetailsView::ShowProgress(double value, bool visible) {
   child_at(kTitleRowSeparatorIndex)->SetVisible(!visible);
 }
 
-void TrayDetailsView::HandleViewClicked(views::View* view) {}
+void TrayDetailsView::HandleViewClicked(views::View* view) {
+  NOTREACHED();
+}
 
 void TrayDetailsView::HandleButtonPressed(views::Button* sender,
-                                          const ui::Event& event) {}
+                                          const ui::Event& event) {
+  NOTREACHED();
+}
 
 void TrayDetailsView::CreateExtraTitleRowButtons() {}