Also remove StateManager11::invalidateEverything. With all state
application consolidated in the StateManager, it should be aware of
all state changes, and shouldn't need outside notifications.

BUG=angleproject:2052

Change-Id: I6748b3944b25f958fa093052bcb7336e66255dd4
Reviewed-on: https://chromium-review.googlesource.com/659400
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>