normalize string_util (#708)

* refactoring string_util
* port string_util to iOS

1 files changed, 2 insertions, 2 deletions

diff --git a/Firestore/Source/Local/FSTLevelDBMutationQueue.mm b/Firestore/Source/Local/FSTLevelDBMutationQueue.mm
index 56a22a1..74463ee 100644
--- a/Firestore/Source/Local/FSTLevelDBMutationQueue.mm
+++ b/Firestore/Source/Local/FSTLevelDBMutationQueue.mm
@@ -35,7 +35,7 @@
 #import "Firestore/Source/Util/FSTAssert.h"
 
 #include "Firestore/Port/ordered_code.h"
-#include "Firestore/Port/string_util.h"
+#include "Firestore/core/src/firebase/firestore/util/string_util.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -164,7 +164,7 @@ static ReadOptions StandardReadOptions() {
   while (moreUserIDs) {
     // Compute the first key after the last mutation for nextUserID.
     auto userEnd = [FSTLevelDBMutationKey keyPrefixWithUserID:nextUserID];
-    userEnd = Firestore::PrefixSuccessor(userEnd);
+    userEnd = firebase::firestore::util::PrefixSuccessor(userEnd);
 
     // Seek to that key with the intent of finding the boundary between nextUserID's mutations
     // and the one after that (if any).