Provide java.util.Collections#shuffle as extensions for collections in JS

#KT-2460

libraries/stdlib/common/src/kotlin/CollectionsH.kt

@@ -149,10 +149,12 @@ expect inline fun <reified T> Array<out T>?.orEmpty(): Array<out T>
 
 expect inline fun <reified T> Collection<T>.toTypedArray(): Array<T>
 
-@SinceKotlin("1.2")
-expect fun <T> MutableList<T>.fill(value: T): Unit
-expect fun <T : Comparable<T>> MutableList<T>.sort(): Unit
-expect fun <T> MutableList<T>.sortWith(comparator: Comparator<in T>): Unit
+@SinceKotlin("1.2") header fun <T> MutableList<T>.fill(value: T): Unit
+@SinceKotlin("1.2") header fun <T> MutableList<T>.shuffle(): Unit
+@SinceKotlin("1.2") header fun <T> Iterable<T>.shuffled(): List<T>
+
+header fun <T : Comparable<T>> MutableList<T>.sort(): Unit
+header fun <T> MutableList<T>.sortWith(comparator: Comparator<in T>): Unit
 
 
 // from Grouping.kt

libraries/stdlib/test/collections/MutableCollectionsTest.kt

@@ -101,7 +101,6 @@ class MutableCollectionTest {
         assertEquals(listOf(42, 42, 42), list)
     }
 
-    @JvmVersion
     @Test fun shuffled() {
         val list = MutableList(100) { it }
         val shuffled = list.shuffled()
@@ -127,6 +126,4 @@ class MutableCollectionTest {
 
         assertEquals(shuffled1, shuffled2)
     }
-
-
 }