Fix the crash on clicking buttons in Bluetooth system menu in debug build.

ash/common/system/chromeos/bluetooth/tray_bluetooth.cc

Index: ash/common/system/chromeos/bluetooth/tray_bluetooth.cc
diff --git a/ash/common/system/chromeos/bluetooth/tray_bluetooth.cc b/ash/common/system/chromeos/bluetooth/tray_bluetooth.cc
index 80a3cbc0d90f16c0049e4867636536e62a3cd3db..a6a6c5e287a83ede7a2e41aefbffb223d0853f1a 100644
--- a/ash/common/system/chromeos/bluetooth/tray_bluetooth.cc
+++ b/ash/common/system/chromeos/bluetooth/tray_bluetooth.cc
@@ -454,8 +454,8 @@ class BluetoothDetailedView : public TrayDetailsView {
       WmShell::Get()->system_tray_delegate()->ToggleBluetooth();
     else if (sender == settings_)
       ShowSettings();
-
-    NOTREACHED();
+    else
+      NOTREACHED();
   }
 
   void CreateExtraTitleRowButtons() override {