Fix opening of print dialog on IE when testing dart2js

Review URL: https://codereview.chromium.org//11033044

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13273 260f80e4-7a28-3924-810f-c04153c831b5

lib/compiler/implementation/lib/js_helper.dart

@@ -378,8 +378,11 @@ class Primitives {
     }
 
     // Inside browser.
-    if (JS('bool', r'typeof console == "object"')) {
-      JS('void', r'console.log(#)', string);
+    if (JS('bool', r'typeof window == "object"')) {
+      // On IE, the console is only defined if dev tools is open.
+      if (JS('bool', r'typeof console == "object"')) {
+        JS('void', r'console.log(#)', string);
+      }
       return;
     }