Fix debugger

tool/sdk_expected_errors.txt

Index: tool/sdk_expected_errors.txt
diff --git a/tool/sdk_expected_errors.txt b/tool/sdk_expected_errors.txt
index 7f0f3c97ab9c39b6c8bde71bd443cf783502e97e..64ee129487daaae8b378966a3155323575396e6c 100644
--- a/tool/sdk_expected_errors.txt
+++ b/tool/sdk_expected_errors.txt
@@ -1,3 +1,4 @@
+[error] Undefined name 'customNames' (dart:_debugger, line 381, col 13)
 [error] The argument type 'InternalMap' cannot be assigned to the parameter type 'Map'. (dart:_isolate_helper/isolate_serialization.dart, line 47, col 47)
 [error] Base class introduces an invalid override. The type of JSArray.[]= ((int, E) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:_interceptors/js_array.dart, line 576, col 25)
 [error] Invalid override. The type of NativeTypedArrayOfDouble.[]= ((int, num) → void) is not a subtype of JSMutableIndexable.[]= ((int, dynamic) → dynamic). (dart:_native_typed_data, line 793, col 3)
@@ -31,7 +32,7 @@
 [error] The part was not supplied as an input to the compiler. (dart:html_common/filtered_element_list.dart, line 1, col 1)
 [error] The part was not supplied as an input to the compiler. (dart:html_common/lists.dart, line 1, col 1)
 [error] Invalid override. The type of JsArray.[]= ((Object, E) → void) is not a subtype of JsObject.[]= ((Object, dynamic) → dynamic). (dart:js, line 363, col 3)
-[warning] Unsound implicit cast from dynamic to List<String> (dart:_debugger, line 24, col 45)
+[warning] Unsound implicit cast from dynamic to List<String> (dart:_debugger, line 25, col 45)
 [warning] Unsound implicit cast from dynamic to List<String> (dart:_isolate_helper, line 839, col 37)
 [warning] Unsound implicit cast from dynamic to List<String> (dart:_isolate_helper, line 886, col 11)
 [warning] Unsound implicit cast from dynamic to E (dart:_interceptors/js_array.dart, line 107, col 12)