Background

The mfLazyLoadImages cookie was added in rEMFR89ad4e5f3c00: Allow opt in to lazy loaded images via cookie (T127883: Enable lazy loaded images for 50% of users in production) so that the lazily loaded images feature could be enabled for a fraction of the overall population of users.

As the lazily loaded images feature is now fully deployed, this cookie is now redundant.

AC

• Remove all references to mfLazyLoadedImages and MobileContext::LAZY_LOAD_IMAGES_COOKIE_{NAME,VALUE} from MobileFrontend codebase.
• Remove any reference to the mfLazyLoadedImages cookie from the MobileFrontend on-wiki documentation.
• Update the WMF cookie policy, if applicable.