Use different file for navigation test because of test framework limitation.

libraries/stdlib/src/kotlin/collections/Iterators.kt

@@ -1,11 +1,11 @@
 package kotlin
 
-import java.util.*
+import java.util.Enumeration
 
 /**
 Helper to make java.util.Enumeration usable in for
  */
-public fun <T> java.util.Enumeration<T>.iterator(): Iterator<T> = object: Iterator<T> {
+public fun <T> Enumeration<T>.iterator(): Iterator<T> = object: Iterator<T> {
     override fun hasNext(): Boolean = hasMoreElements()
 
     public override fun next(): T = nextElement()