bluetooth: Remove queuing of GetCharacteristicsCallbacks

device/bluetooth/device.h

 // Copyright 2016 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.
 
 #ifndef DEVICE_BLUETOOTH_DEVICE_H_
 #define DEVICE_BLUETOOTH_DEVICE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 45 matching lines @@
 
  private:
   Device(scoped_refptr<device::BluetoothAdapter> adapter,
          std::unique_ptr<device::BluetoothGattConnection> connection);
 
   void GetServicesImpl(const GetServicesCallback& callback);
 
   mojom::ServiceInfoPtr ConstructServiceInfoStruct(
       const device::BluetoothRemoteGattService& service);
 
-  void GetCharacteristicsImpl(const std::string& service_id,
-                              const GetCharacteristicsCallback& callback);
-
   const std::string& GetAddress();
 
   // The current BluetoothAdapter.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
   // The GATT connection to this device.
   std::unique_ptr<device::BluetoothGattConnection> connection_;
 
   mojo::StrongBindingPtr<mojom::Device> binding_;
 
   // The services request queue which holds callbacks that are waiting for
   // services to be discovered for this device.
   std::vector<base::Closure> pending_services_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(Device);
 };
 
 }  // namespace bluetooth
 
 #endif  // DEVICE_BLUETOOTH_DEVICE_H_