device/bluetooth: Add chromeos::BluetoothRemoteGattCharacteristicChromeOS.

device/bluetooth/bluetooth_gatt_descriptor.h

 // Copyright 2014 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_BLUETOOTH_GATT_DESCRIPTOR_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_DESCRIPTOR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 128 matching lines @@
   virtual bool IsLocal() const = 0;
 
   // Returns the value of the descriptor. For remote descriptors, this is the
   // most recently cached value of the remote descriptor. For local descriptors
   // this is the most recently updated value or the value retrieved from the
   // delegate.
   virtual const std::vector<uint8>& GetValue() const = 0;
 
   // Returns a pointer to the GATT characteristic that this characteristic
   // descriptor belongs to.
-  virtual const BluetoothGattCharacteristic* GetCharacteristic() const = 0;
+  virtual BluetoothGattCharacteristic* GetCharacteristic() const = 0;
 
   // Sends a read request to a remote characteristic descriptor to read its
   // value. |callback| is called to return the read value on success and
   // |error_callback| is called for failures.
   virtual void ReadRemoteDescriptor(const ValueCallback& callback,
                                     const ErrorCallback& error_callback) = 0;
 
   // Sends a write request to a remote characteristic descriptor, to modify the
   // value of the descriptor starting at offset |offset| with the new value
   // |new_value|. |callback| is called to signal success and |error_callback|
   // for failures. This method only applies to remote descriptors and will fail
   // for those that are locally hosted.
   virtual void WriteRemoteDescriptor(
       int offset,
       const std::vector<uint8>& new_value,
       const base::Closure& callback,
       const ErrorCallback& error_callback) = 0;
 
  protected:
   BluetoothGattDescriptor();
   virtual ~BluetoothGattDescriptor();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattDescriptor);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_GATT_DESCRIPTOR_H_