Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt

device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc

Index: device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc
diff --git a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc
index e4123f67741db1a75d06e85469e36288f1613452..4123e2d342dbaaca59093d62c1ff4ac8538de20e 100644
--- a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc
+++ b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.cc
@@ -11,9 +11,8 @@ using testing::Return;
 namespace device {
 
 MockBluetoothGattNotifySession::MockBluetoothGattNotifySession(
-    const std::string& characteristic_identifier) {
-  ON_CALL(*this, GetCharacteristicIdentifier())
-      .WillByDefault(Return(characteristic_identifier));
+    base::WeakPtr<BluetoothRemoteGattCharacteristic> characteristic)
+    : BluetoothGattNotifySession(characteristic) {
   ON_CALL(*this, IsActive()).WillByDefault(Return(true));
 }