Support JS$ prefix for dart and fix bug where _operator_getter and the [] operator were used incons…

tools/dom/scripts/generator.py

Index: tools/dom/scripts/generator.py
diff --git a/tools/dom/scripts/generator.py b/tools/dom/scripts/generator.py
index 92a5ed0e98c37a40eeb851c0f296c0f82f14b83c..6d235b816f53147a6f71e835d90876aa976dcb45 100644
--- a/tools/dom/scripts/generator.py
+++ b/tools/dom/scripts/generator.py
@@ -546,14 +546,10 @@ class OperationInfo(object):
         if (wrap_unwrap_type_blink(type_id, type_registry)):
           type_is_callback = self.isCallback(type_registry, type_id)
           if (dart_js_interop and type_id == 'EventListener' and
-              (self.name == 'addEventListener')):
+              self.name in ['addEventListener', 'removeEventListener']):
               # Events fired need use a JsFunction not a anonymous closure to
               # insure the event can really be removed.
-              parameters.append('wrap_event_listener(this, %s)' % p.name)
-          elif (dart_js_interop and type_id == 'EventListener' and
-              (self.name == 'removeEventListener')):
-              # Find the JsFunction that corresponds to this Dart function.
-              parameters.append('_knownListeners[this.hashCode][identityHashCode(%s)]' % p.name)
+              parameters.append('unwrap_jso(js.allowInterop(%s))' % p.name)
           elif dart_js_interop and type_id == 'FontFaceSetForEachCallback':
               # forEach is supported in the DOM for FontFaceSet as it iterates
               # over the Javascript Object the callback parameters are also