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Moti Zilberman
266122248f
Summary: Changelog: [Internal] Replaces the copypasta'd `PageTarget::forEachSession`, `InstanceTarget::forEachAgent` and `RuntimeTarget::forEachAgent` with a shared utility class for managing a list of `weak_ptr`s. In a `WeakList`, elements can only be added (`insert`), iterated over (`forEach`), and counted (`size`, `empty`). Conceptually, elements are automatically removed from the list as soon as they're destroyed, but internally, space is reclaimed *lazily*: the next time we have a reason to iterate over the underlying list, we delete any pointers that are found to be null. ## Naming This is almost a WeakSet, but we don't bother checking for duplicates, hence "WeakList". Reviewed By: hoxyq Differential Revision: D53671483 fbshipit-source-id: 460bfbaa2b8e821281dc352fed0946f99352c9fc