Remove java.util.* imports from common code.

libraries/stdlib/test/js/JsArrayTest.kt

@@ -18,7 +18,6 @@ package test.collections.js
 
 import org.junit.Test as test
 import kotlin.test.*
-import java.util.*
 
 class JsArrayTest {
 

libraries/stdlib/test/js/MapJsTest.kt

@@ -2,7 +2,6 @@ package test.collections.js
 
 import kotlin.test.*
 import org.junit.Test as test
-import java.util.*
 import test.collections.*
 import test.collections.behaviors.*
 

libraries/stdlib/test/js/SetJsTest.kt

@@ -4,7 +4,6 @@ import kotlin.test.*
 import org.junit.Test
 import test.collections.*
 import test.collections.behaviors.*
-import java.util.*
 
 class ComplexSetJsTest : SetJsTest() {
     // Helper function with generic parameter to force to use ComlpexHashMap

libraries/stdlib/test/js/StubsJVM.kt

@@ -14,10 +14,9 @@
  * limitations under the License.
  */
 
+@file:JvmVersion
 package test.collections.js
 
-import java.util.*
-
 public fun <V> stringMapOf(vararg pairs: Pair<String, V>): HashMap<String, V> = hashMapOf<String, V>(*pairs)
 public fun <V> linkedStringMapOf(vararg pairs: Pair<String, V>): LinkedHashMap<String, V> = linkedMapOf(*pairs)
 public fun stringSetOf(vararg elements: String): HashSet<String> = hashSetOf(*elements)