History Fetch updated method name and added a documentation comment …

…that it fetches last month only

Client/Frontend/Sync/BraveCore/BraveCoreMigrator.swift

@@ -307,7 +307,7 @@ extension BraveCoreMigrator {
         DataController.performOnMainContext { context in
             var didSucceed = true
 
-            for history in History.fetchAllHistory(context) {
+            for history in History.fetchMigrationHistory(context) {
                 if self.migrateChromiumHistory(context: context, history: history) {
                     history.delete()
                 } else {

Data/models/History.swift

@@ -111,9 +111,15 @@ public final class History: NSManagedObject, WebsitePresentable, CRUD {
         return all(where: predicate, fetchLimit: 100, context: DataController.viewContext) ?? []
     }
 
-    public class func fetchAllHistory(_ context: NSManagedObjectContext? = nil, visitedAscending: Bool = false) -> [History] {
+    /// Fetching the History items for migration
+    /// The last month's data is being displayed to user
+    /// so data in this period data fetched from old history for migration
+    /// - Parameters:
+    ///   - context: Managed Object Context
+    /// - Returns: Return old history items from core data    
+    public class func fetchMigrationHistory(_ context: NSManagedObjectContext? = nil) -> [History] {
         let predicate = NSPredicate(format: "visitedOn >= %@", History.thisMonth as CVarArg)
-        let sortDescriptors = [NSSortDescriptor(key: "visitedOn", ascending: visitedAscending)]
+        let sortDescriptors = [NSSortDescriptor(key: "visitedOn", ascending: false)]
 
         return all(where: predicate, sortDescriptors: sortDescriptors, context: context ?? DataController.viewContext) ?? []
     }