dart2js_native tests: Migrate 'native STRING' to JS-calls

tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart

Index: tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart b/tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart
index d7d115055a91b15d744e4a8855b2c4d6a5c62eb6..0bd930aef63344ceda47eb064a0631f7917ebdc2 100644
--- a/tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_use_native_name_in_table_frog_test.dart
@@ -18,28 +18,31 @@ class B extends A {}
 A makeA() native;
 B makeB() native;
 
-void setup() native """
-function inherits(child, parent) {
-  if (child.prototype.__proto__) {
-    child.prototype.__proto__ = parent.prototype;
-  } else {
-    function tmp() {};
-    tmp.prototype = parent.prototype;
-    child.prototype = new tmp();
-    child.prototype.constructor = child;
+void setup() {
+  JS('', r"""
+(function(){
+  function inherits(child, parent) {
+    if (child.prototype.__proto__) {
+      child.prototype.__proto__ = parent.prototype;
+    } else {
+      function tmp() {};
+      tmp.prototype = parent.prototype;
+      child.prototype = new tmp();
+      child.prototype.constructor = child;
+    }
   }
-}
-function NativeA() {}
-function NativeB() {}
-inherits(NativeB, NativeA);
-NativeA.prototype.foo = function() { return 42; };
+  function NativeA() {}
+  function NativeB() {}
+  inherits(NativeB, NativeA);
+  NativeA.prototype.foo = function() { return 42; };
 
-makeA = function(){return new NativeA;};
-makeB = function(){return new NativeB;};
+  makeA = function(){return new NativeA()};
+  makeB = function(){return new NativeB()};
 
-self.nativeConstructor(NativeA);
-self.nativeConstructor(NativeB);
-""";
+  self.nativeConstructor(NativeA);
+  self.nativeConstructor(NativeB);
+})()""");
+}
 
 main() {
   nativeTesting();