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

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/bluetooth/tray_bluetooth.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
@@ skipping 436 matching lines @@
     UpdateClickedDevice(device_id, view);
     delegate->ConnectToBluetoothDevice(device_id);
   }
 
   void HandleButtonPressed(views::Button* sender,
                            const ui::Event& event) override {
     if (sender == toggle_)
       WmShell::Get()->system_tray_delegate()->ToggleBluetooth();
     else if (sender == settings_)
       ShowSettings();
-
-    NOTREACHED();
+    else
+      NOTREACHED();
   }
 
   void CreateExtraTitleRowButtons() override {
     if (login_ == LoginStatus::LOCKED)
       return;
 
     DCHECK(!toggle_);
     DCHECK(!settings_);
 
     tri_view()->SetContainerVisible(TriView::Container::END, true);
@@ skipping 149 matching lines @@
     detailed_->Update();
 }
 
 void TrayBluetooth::OnBluetoothDiscoveringChanged() {
   if (!detailed_)
     return;
   detailed_->Update();
 }
 
 }  // namespace ash