How to fix the «Invalid block type: MagentoGoogleOptimizerBlockAdminhtmlFormCmsPage» failure?

[dmitry_fedyuk (Dmitrii Fediuk)]

Locate the line

https://github.com/magento/magento2/blob/62667cb6/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/cms_page_form.xml#L16-L16

Comment it out:

<!--
<block name="googleOptimizerBlockAdminhtmlFormCmsPage" class="MagentoGoogleOptimizerBlockAdminhtmlFormCmsPage"/>
-->

The bug has been added on 2017-04-10 by the following commit:
https://github.com/magento/magento2/commit/fe448f7aff#diff-88029e095d1b6bd47cc9d66d1fed21da

[dmitry_fedyuk (Dmitrii Fediuk)]

It has been fixed in the core in 52 days on 2017-05-31:

https://github.com/magento/magento2/commit/62b5bb46