Remove unused shutdown methods (#993)

* Drop mutation queue shutdown

* Drop query cache shutdown

* Drop remote document cache shutdown

* Drop local store shutdown

* drop newline

1 files changed, 0 insertions, 3 deletions

diff --git a/Firestore/Source/Local/FSTMemoryMutationQueue.mm b/Firestore/Source/Local/FSTMemoryMutationQueue.mm
index 5419c8a..8028bb3 100644
--- a/Firestore/Source/Local/FSTMemoryMutationQueue.mm
+++ b/Firestore/Source/Local/FSTMemoryMutationQueue.mm
@@ -105,9 +105,6 @@ static const NSComparator NumberComparator = ^NSComparisonResult(NSNumber *left,
             @"highestAcknowledgedBatchID must be less than the nextBatchID");
 }
 
-- (void)shutdown {
-}
-
 - (BOOL)isEmpty {
   // If the queue has any entries at all, the first entry must not be a tombstone (otherwise it
   // would have been removed already).