bluetooth: Create base class BluetoothDevice::CreateGattConnection impl.

device/bluetooth/bluetooth_gatt_connection_chromeos.h

Index: device/bluetooth/bluetooth_gatt_connection_chromeos.h
diff --git a/device/bluetooth/bluetooth_gatt_connection_chromeos.h b/device/bluetooth/bluetooth_gatt_connection_chromeos.h
index f6c746964a551cc6e9fdf024f9794ee307418428..2727a2354b87abc4063bbfd23f889e1d4ed79627 100644
--- a/device/bluetooth/bluetooth_gatt_connection_chromeos.h
+++ b/device/bluetooth/bluetooth_gatt_connection_chromeos.h
@@ -34,7 +34,6 @@ class BluetoothGattConnectionChromeOS
   ~BluetoothGattConnectionChromeOS() override;
 
   // BluetoothGattConnection overrides.
-  std::string GetDeviceAddress() const override;
   bool IsConnected() override;
   void Disconnect() override;
 
@@ -48,12 +47,6 @@ class BluetoothGattConnectionChromeOS
   // True, if the connection is currently active.
   bool connected_;
 
-  // The Bluetooth adapter that this connection is associated with.
-  scoped_refptr<device::BluetoothAdapter> adapter_;
-
-  // Bluetooth address of the underlying device.
-  std::string device_address_;
-
   // D-Bus object path of the underlying device. This is used to filter observer
   // events.
   dbus::ObjectPath object_path_;