Drop private EchoCachedList::ONE_DAY, unused
Drop private EchoCachedList::ONE_DAY, unused

Change-Id: I14e53bcd593161c2fb6e29a5d280615d8694ebb4

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo