[ads] Unify iOS kBraveNTPBrandedWallpaper

Sources/Brave/Frontend/Browser/HomePanel/NTPDataSource.swift

@@ -71,12 +71,6 @@ public class NTPDataSource {
   /// This is reset on each launch, so `3` can be shown again if app is removed from memory.
   /// This number _must_ be less than the number of backgrounds!
   private static let numberOfDuplicateAvoidance = 6
-  /// The number of images in a sponsorship rotation.
-  ///     i.e. This number will be repeated before a new sponsorship is shown.
-  ///          If sposnored image is shown as Nth image, this number of normal images will be shown before Nth is reached again.
-  private static let sponsorshipShowRate = 4
-  /// On this value, a sponsored image will be shown.
-  private static let sponsorshipShowValue = 2
 
   /// The counter that indicates what background should be shown, this is used to determine when a new
   ///     sponsored image should be shown. (`1` means, first image in cycle N, should be shown).
@@ -133,7 +127,7 @@ public class NTPDataSource {
       if let sponsor = service.sponsoredImageData {
         let attemptSponsored =
           Preferences.NewTabPage.backgroundSponsoredImages.value
-          && backgroundRotationCounter == NTPDataSource.sponsorshipShowValue
+          && backgroundRotationCounter == service.initialCountToBrandedWallpaper
           && !privateBrowsingManager.isPrivateBrowsing
 
         if attemptSponsored {
@@ -186,7 +180,7 @@ public class NTPDataSource {
     }()
 
     // Force back to `0` if at end
-    backgroundRotationCounter %= NTPDataSource.sponsorshipShowRate
+    backgroundRotationCounter %= service.countToBrandedWallpaper
     // Increment regardless, this is a counter, not an index, so smallest should be `1`
     backgroundRotationCounter += 1