Label.php

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<?php
namespace Magento\Framework\View\Design\Theme;

class Label implements \Magento\Framework\Option\ArrayInterface
{
    protected $_labelsCollection;

    public function __construct(\Magento\Framework\View\Design\Theme\Label\ListInterface $labelList)
    {
        $this->_labelsCollection = $labelList;
    }

    public function getLabelsCollection($label = false)
    {
        $options = $this->_labelsCollection->getLabels();
        if ($label) {
            array_unshift($options, ['value' => '', 'label' => $label]);
        }
        return $options;
    }

    public function getLabelsCollectionForSystemConfiguration()
    {
        return $this->toOptionArray();
    }

    public function toOptionArray()
    {
        return $this->getLabelsCollection((string)new \Magento\Framework\Phrase('-- No Theme --'));
    }
}