Delete unused `combine` extension in `SyncUtilities.kt`

core/data/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/SyncUtilities.kt

@@ -19,8 +19,6 @@ package com.google.samples.apps.nowinandroid.core.data
 import android.util.Log
 import com.google.samples.apps.nowinandroid.core.datastore.ChangeListVersions
 import com.google.samples.apps.nowinandroid.core.network.model.NetworkChangeList
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.combine
 import kotlin.coroutines.cancellation.CancellationException
 
 /**
@@ -104,29 +102,3 @@ suspend fun Synchronizer.changeListSync(
         versionUpdater(latestVersion)
     }
 }.isSuccess
-
-/**
- * Returns a [Flow] whose values are generated by [transform] function that process the most
- * recently emitted values by each flow.
- */
-fun <T1, T2, T3, T4, T5, T6, R> combine(
-    flow: Flow<T1>,
-    flow2: Flow<T2>,
-    flow3: Flow<T3>,
-    flow4: Flow<T4>,
-    flow5: Flow<T5>,
-    flow6: Flow<T6>,
-    transform: suspend (T1, T2, T3, T4, T5, T6) -> R,
-): Flow<R> = combine(
-    combine(flow, flow2, flow3, ::Triple),
-    combine(flow4, flow5, flow6, ::Triple),
-) { t1, t2 ->
-    transform(
-        t1.first,
-        t1.second,
-        t1.third,
-        t2.first,
-        t2.second,
-        t2.third,
-    )
-}