changed js tests/library after collections mapping

js/js.libraries/src/core/javautilCode.kt

@@ -36,7 +36,7 @@ public object Collections {
     }
 
     library
-    public fun <T> reverse(list: List<T>): Unit {
+    public fun <T> reverse(list: MutableList<T>): Unit {
         val size = list.size()
         for (i in 0.rangeTo(size / 2)) {
             val i2 = size - i

js/js.libraries/src/core/string.kt

@@ -1,7 +1,5 @@
 package js
 
-import java.util.List
-
 native public fun String.toUpperCase() : String = js.noImpl
 
 native public fun String.toLowerCase() : String = js.noImpl