5b33f03e5e
DynamicMap#plugins() creates a new TreeSet on every invocation. We were just doing this to presize an ArrayList, which makes it seem like we care about reducing allocations, but was probably actually increasing allocations. Fortunately, we can just presize using the multimap we already have. This also allows us to remove a redundant instance field. Change-Id: Ie5998add61d4848e184a37f4f237da132802a00f