| Index: sdk/lib/_internal/compiler/js_lib/foreign_helper.dart | 
| diff --git a/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart b/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart | 
| index 6b587934b4d35a82ba1afefa0d0c7eac130e476d..e5e7f6fdfdb1aafabe32d48abb136efd61b04d21 100644 | 
| --- a/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart | 
| +++ b/sdk/lib/_internal/compiler/js_lib/foreign_helper.dart | 
| @@ -198,11 +198,6 @@ void JS_SET_CURRENT_ISOLATE(isolate) {} | 
| JS_INTERCEPTOR_CONSTANT(Type type) {} | 
|  | 
| /** | 
| - * Returns the prefix used for generated is checks on classes. | 
| - */ | 
| -String JS_OPERATOR_IS_PREFIX() {} | 
| - | 
| -/** | 
| * Returns the prefix used for generated type argument substitutions on classes. | 
| */ | 
| String JS_OPERATOR_AS_PREFIX() {} | 
|  |