bluetooth: Create base class BluetoothDevice::CreateGattConnection impl.

device/bluetooth/bluetooth_gatt_connection_chromeos.cc

Index: device/bluetooth/bluetooth_gatt_connection_chromeos.cc
diff --git a/device/bluetooth/bluetooth_gatt_connection_chromeos.cc b/device/bluetooth/bluetooth_gatt_connection_chromeos.cc
index b0551cff1dc16295e7f991ee756e9cbd13568087..93b9747adcebc1cc8328e05be635f1f647de5158 100644
--- a/device/bluetooth/bluetooth_gatt_connection_chromeos.cc
+++ b/device/bluetooth/bluetooth_gatt_connection_chromeos.cc
@@ -16,9 +16,8 @@ BluetoothGattConnectionChromeOS::BluetoothGattConnectionChromeOS(
     scoped_refptr<device::BluetoothAdapter> adapter,
     const std::string& device_address,
     const dbus::ObjectPath& object_path)
-    : connected_(true),
-      adapter_(adapter),
-      device_address_(device_address),
+    : BluetoothGattConnection(adapter.get(), device_address),
+      connected_(true),
       object_path_(object_path) {
   DCHECK(adapter_.get());
   DCHECK(!device_address_.empty());
@@ -32,10 +31,6 @@ BluetoothGattConnectionChromeOS::~BluetoothGattConnectionChromeOS() {
   Disconnect();
 }
 
-std::string BluetoothGattConnectionChromeOS::GetDeviceAddress() const {
-  return device_address_;
-}
-
 bool BluetoothGattConnectionChromeOS::IsConnected() {
   // Lazily determine the activity state of the connection. If already
   // marked as inactive, then return false. Otherwise, explicitly mark