cros: Convert SystemTrayDelegate::ManageBluetoothDevices to mojo for mash

ash/common/system/tray/system_tray_delegate.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/tray/system_tray_delegate.h"
 
 #include "ash/common/system/tray/ime_info.h"
 #include "ash/common/system/tray/system_tray_item.h"
 
 namespace ash {
@@ skipping 76 matching lines @@
 void SystemTrayDelegate::GetCurrentIMEProperties(IMEPropertyInfoList* list) {}
 
 base::string16 SystemTrayDelegate::GetIMEManagedMessage() {
   return base::string16();
 }
 
 void SystemTrayDelegate::SwitchIME(const std::string& ime_id) {}
 
 void SystemTrayDelegate::ActivateIMEProperty(const std::string& key) {}
 
-void SystemTrayDelegate::ManageBluetoothDevices() {}
-
 void SystemTrayDelegate::ToggleBluetooth() {}
 
 bool SystemTrayDelegate::IsBluetoothDiscovering() const {
   return false;
 }
 
 bool SystemTrayDelegate::GetBluetoothAvailable() {
   return false;
 }
 
@@ skipping 35 matching lines @@
 
 void SystemTrayDelegate::RemoveCustodianInfoTrayObserver(
     CustodianInfoTrayObserver* observer) {}
 
 std::unique_ptr<SystemTrayItem> SystemTrayDelegate::CreateRotationLockTrayItem(
     SystemTray* tray) {
   return nullptr;
 }
 
 }  // namespace ash