Cleanup deprecated symbol usages in testData

js/js.translator/testData/operatorOverloading/cases/overloadPlusAssignArrayList.kt

@@ -24,5 +24,5 @@ fun box(): String {
     v1.add("foo")
     v2.add("bar")
     v1 += v2
-    return if (v1.contents.size() == 2) "OK" else "fail"
+    return if (v1.contents.size == 2) "OK" else "fail"
 }

js/js.translator/testData/operatorOverloading/cases/overloadPlusAssignViaExtensionFunction.kt

@@ -19,5 +19,5 @@ fun box(): Boolean {
     val a = A(v1)
     a += v2
 
-    return (v1.size() == 2 && v1[0] == "foo" && v1[1] == "bar")
+    return (v1.size == 2 && v1[0] == "foo" && v1[1] == "bar")
 }

js/js.translator/testData/operatorOverloading/cases/overloadPlusViaExtensionFunction.kt

@@ -16,5 +16,5 @@ fun box(): Boolean {
     v2.add("bar")
     val v = v1 + v2
 
-    return (v.size() == 2 && v[0] == "foo" && v[1] == "bar")
+    return (v.size == 2 && v[0] == "foo" && v[1] == "bar")
 }