5a9b4d7435
Summary: This is a manual commit of this PR: Retire InMemoryEnv in favor of MockEnv #2082 With MockEnv doing the same yet being more mature, InMemoryEnv is redundant. Reviewed By: IslamAbdelRahman Differential Revision: D5162323 fbshipit-source-id: 59fd0082a891dc99cc531e4da9d68bf891eae3f5