Compute NativeBasicData for KernelWorldBuilder

pkg/compiler/lib/src/js_backend/native_data.dart

Index: pkg/compiler/lib/src/js_backend/native_data.dart
diff --git a/pkg/compiler/lib/src/js_backend/native_data.dart b/pkg/compiler/lib/src/js_backend/native_data.dart
index 2cc38824ba22d79452324658060129f5eb046b9e..5029821e0f105e48883b1300041833553466850c 100644
--- a/pkg/compiler/lib/src/js_backend/native_data.dart
+++ b/pkg/compiler/lib/src/js_backend/native_data.dart
@@ -156,8 +156,7 @@ class NativeBasicDataBuilderImpl implements NativeBasicDataBuilder {
   /// The tag info string contains comma-separated 'words' which are either
   /// dispatch tags (having JavaScript identifier syntax) and directives that
   /// begin with `!`.
-  void setNativeClassTagInfo(ClassEntity cls, String tagInfo) {
-    String tagText = tagInfo.substring(1, tagInfo.length - 1);
+  void setNativeClassTagInfo(ClassEntity cls, String tagText) {
     // TODO(johnniwinther): Assert that this is only called once. The memory
     // compiler copies pre-processed elements into a new compiler through
     // [Compiler.onLibraryScanned] and thereby causes multiple calls to this