Update classes and interfaces part 2

[sivaschenko]

Update the following classes and interfaces in 2.5-develop branch

1. Magento\Framework\Data\Form\Element\Factory Change visibility of protected properties to private
2. Magento\Customer\Controller\Adminhtml\Index Remove deprecated methods and properties
3. Magento\Sales\Model\Order\Email\Sender\OrderSender Change visibility of protected properties and methods to private
4. Magento\Sales\Model\Order\Email\Sender\InvoiceSender Change visibility of protected properties and methods to private
5. Magento\Customer\Model\Url Change visibility of protected properties to private
6. Magento\Framework\UrlFactory Change visibility of protected properties to private
7. Magento\Cms\Model\Template\FilterProvider Change visibility of protected properties to private
8. Magento\Sales\Model\Service\InvoiceService Change visibility of protected properties to private
9. Magento\Framework\HTTP\Adapter\Curl Change visibility of protected properties and methods to private
10. Magento\Framework\Convert\DataObject Change visibility of protected properties and methods to private

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
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[ProkopovVitaliy]

@magento i am working on this