Port FSTDocumentKeySet to C++ DocumentKeySet (#1229)

* Define a Comparator for DocumentKey

* Automated migration from FSTDocumentKeySet to DocumentKeySet

* Manual fixups for DocumentKeySet

* Delete FSTDocumentKeySet

1 files changed, 2 insertions, 2 deletions

diff --git a/Firestore/Source/Core/FSTFirestoreClient.mm b/Firestore/Source/Core/FSTFirestoreClient.mm
index f1b4ffd..658cf57 100644
--- a/Firestore/Source/Core/FSTFirestoreClient.mm
+++ b/Firestore/Source/Core/FSTFirestoreClient.mm
@@ -56,6 +56,7 @@ using firebase::firestore::auth::CredentialsProvider;
 using firebase::firestore::auth::User;
 using firebase::firestore::core::DatabaseInfo;
 using firebase::firestore::model::DatabaseId;
+using firebase::firestore::model::DocumentKeySet;
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -312,9 +313,8 @@ NS_ASSUME_NONNULL_BEGIN
                                              NSError *_Nullable error))completion {
   [self.workerDispatchQueue dispatchAsync:^{
     FSTDocumentDictionary *docs = [self.localStore executeQuery:query.query];
-    FSTDocumentKeySet *remoteKeys = [FSTDocumentKeySet keySet];
 
-    FSTView *view = [[FSTView alloc] initWithQuery:query.query remoteDocuments:remoteKeys];
+    FSTView *view = [[FSTView alloc] initWithQuery:query.query remoteDocuments:DocumentKeySet{}];
     FSTViewDocumentChanges *viewDocChanges = [view computeChangesWithDocuments:docs];
     FSTViewChange *viewChange = [view applyChangesToDocuments:viewDocChanges];
     FSTAssert(viewChange.limboChanges.count == 0,