View file PF.Base/module/core/install/version/3.7.3.xml.php

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<upgrade>
	<hooks>
		<hook>
			<module_id>core</module_id>
			<hook_type>library</hook_type>
			<module>core</module>
			<call_name>request_is_mobile</call_name>
			<added>1384771085</added>
			<version_id>3.7.3</version_id>
			<value />
		</hook>
	</hooks>
</upgrade>