Clean size/length/first/head/empty properties and functions.

libraries/stdlib/test/js/JsArrayScript.kt

@@ -5,7 +5,7 @@ fun testSize(): Int {
     val a2 = array("foo")
     val a3 = array("foo", "bar")
 
-    return a1.size + a2.size + a3.size
+    return a1.size() + a2.size() + a3.size()
 }
 
 fun testToListToString(): String {

libraries/stdlib/test/js/JsArrayTest.kt

@@ -11,9 +11,9 @@ class JsArrayTest {
         val a2 = array("foo")
         val a3 = array("foo", "bar")
 
-        assertEquals(0, a1.size)
-        assertEquals(1, a2.size)
-        assertEquals(2, a3.size)
+        assertEquals(0, a1.size())
+        assertEquals(1, a2.size())
+        assertEquals(2, a3.size())
 
         assertEquals("[]", a1.toList().toString())
         assertEquals("[foo]", a2.toList().toString())
@@ -25,7 +25,7 @@ class JsArrayTest {
         var c: Collection<String>  = array("A", "B", "C").toList()
         var a = ArrayList(c)
 
-        assertEquals(3, a.size)
+        assertEquals(3, a.size())
         assertEquals("A", a[0])
         assertEquals("B", a[1])
         assertEquals("C", a[2])

libraries/stdlib/test/js/MapJsTest.kt

@@ -138,8 +138,8 @@ abstract class MapJsTest {
         assertFalse(data.isEmpty())
         assertFalse(data.empty)
 
-        assertEquals(KEYS.size, data.size())
-        assertEquals(KEYS.size, data.size)
+        assertEquals(KEYS.size(), data.size())
+        assertEquals(KEYS.size(), data.size)
     }
 
     // #KT-3035
@@ -200,7 +200,7 @@ abstract class MapJsTest {
         val map = createTestMap()
         val newMap = emptyMutableMap()
         newMap.putAll(map)
-        assertEquals(KEYS.size, newMap.size)
+        assertEquals(KEYS.size(), newMap.size)
     }
 
     test fun mapRemove() {