Page.php

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<?php
namespace Magento\Cms\Block\Adminhtml;

class Page extends \Magento\Backend\Block\Widget\Grid\Container
{
    protected function _construct()
    {
        $this->_controller = 'adminhtml_page';
        $this->_blockGroup = 'Magento_Cms';
        $this->_headerText = __('Manage Pages');

        parent::_construct();

        if ($this->_isAllowedAction('Magento_Cms::save')) {
            $this->buttonList->update('add', 'label', __('Add New Page'));
        } else {
            $this->buttonList->remove('add');
        }
    }

    protected function _isAllowedAction($resourceId)
    {
        return $this->_authorization->isAllowed($resourceId);
    }
}