Deprecate 'comparator { ... }' in favor of Comparator SAM-constructor. Provide SAM-like constructor for JS.

libraries/stdlib/test/js/javautilCollectionsTest.kt

@@ -1,7 +1,6 @@
 package test.collections
 
-import java.util.Collections
-import java.util.ArrayList
+import java.util.*
 
 import kotlin.test.*
 import org.junit.Test as test
@@ -13,7 +12,7 @@ class JavautilCollectionsTest {
     val TEST_LIST = arrayOf(2, 0, 9, 7, 1).toList()
     val SORTED_TEST_LIST = arrayOf(0, 1, 2, 7, 9).toList()
     val MAX_ELEMENT = 9
-    val COMPARATOR = comparator { x: Int, y: Int ->  if (x > y) 1 else if (x < y) -1 else 0 }
+    val COMPARATOR = Comparator { x: Int, y: Int ->  if (x > y) 1 else if (x < y) -1 else 0 }
 
     @test fun maxWithComparator() {
         assertEquals(MAX_ELEMENT, Collections.max(TEST_LIST, COMPARATOR))