Make breakpoints not crash sky

sky/framework/inspector/inspector.sky

Index: sky/framework/inspector/inspector.sky
diff --git a/sky/framework/inspector/inspector.sky b/sky/framework/inspector/inspector.sky
index b5f3f12ef7d7fddf6f8b7f88dab0bc90dc799529..67d34d05b9712b0b014253342bc9d89bc76295b4 100644
--- a/sky/framework/inspector/inspector.sky
+++ b/sky/framework/inspector/inspector.sky
@@ -82,12 +82,11 @@ InspectorBackend.prototype.onMessage = function(data) {
   if (result != this.ASYNC_RESPONSE)
     this.sendResponse(message.id, result);
   else {
-    window.setTimeout(function(message_id) {
-      if (this.unansweredMessages_.indexOf(message_id) == -1)
+    window.setTimeout(function() {
+      if (this.unansweredMessages_.indexOf(message.id) == -1)
         return;
-      console.log("Error, failed to reply to " + descriptor
-          + " message id " + message_id);
-    }, this.MESSAGE_TIMEOUT_MS, this, message.id);
+      console.log("Error, failed to reply to message id " + message.id);
+    }.bind(this), this.MESSAGE_TIMEOUT_MS);
   }
 };