Initialized BluetoothDetailedView::throbber_.

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/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/tray/fixed_sized_scroll_view.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
@@ skipping 94 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothDefaultView);
 };
 
 class BluetoothDetailedView : public TrayDetailsView {
  public:
   BluetoothDetailedView(SystemTrayItem* owner, LoginStatus login)
       : TrayDetailsView(owner),
         login_(login),
         manage_devices_(nullptr),
+        throbber_(nullptr),
         toggle_bluetooth_(nullptr),
         enable_bluetooth_(nullptr) {
     CreateItems();
   }
 
   ~BluetoothDetailedView() override {
     // Stop discovering bluetooth devices when exiting BT detailed view.
     BluetoothStopDiscovering();
   }
 
@@ skipping 349 matching lines @@
     detailed_->Update();
 }
 
 void TrayBluetooth::OnBluetoothDiscoveringChanged() {
   if (!detailed_)
     return;
   detailed_->Update();
 }
 
 }  // namespace ash