Work-around Frog codegen bug where Window is derived from native DOMWindow.

client/dom/frog/frog_dom.dart

Index: client/dom/frog/frog_dom.dart
diff --git a/client/dom/frog/frog_dom.dart b/client/dom/frog/frog_dom.dart
index e49d092a4ebbe5ebf55fee51a4ce5e92d66d9157..3e382b8dbdd000728867d9c0605a824184dee2f6 100644
--- a/client/dom/frog/frog_dom.dart
+++ b/client/dom/frog/frog_dom.dart
@@ -12,8 +12,9 @@
 
 // #source('src/_FactoryProviders.dart');
 
-// TODO(jmesserly): We need to be smarter about inheriting from a hidden native
-// type (in this case DOMWindow)
+// TODO(jmesserly): 'native' here is aWork-around for Frog bug.  Frog needs to
+// be smarter about inheriting from a hidden native type (in this case
+// DOMWindow)
 class Window extends DOMWindow native "*Window" {}
 DOMWindow get window() native "return window;";
 // TODO(vsm): Revert to Dart method when 508 is fixed.
@@ -836,7 +837,7 @@ class CompositionEvent extends UIEvent native "*CompositionEvent" {
   void initCompositionEvent(String typeArg, bool canBubbleArg, bool cancelableArg, DOMWindow viewArg, String dataArg) native;
 }
 
-class Console native "=console" {
+class Console native "=(typeof console == 'undefined' ? {} : console)" {
 
   MemoryInfo memory;
 
@@ -3217,9 +3218,7 @@ class HTMLMarqueeElement extends HTMLElement native "*HTMLMarqueeElement" {
   void stop() native;
 }
 
-// TODO(jmesserly): this is marked as hidden until we figure out how to fix
-// DumpRenderTree on Mac.
-class HTMLMediaElement extends HTMLElement native "*HTMLMediaElement" {
+class HTMLMediaElement extends HTMLElement native "HTMLMediaElement" {
 
   static final int HAVE_CURRENT_DATA = 2;