Revert "Redo "Make dart2js typed_data implementation classes private""

sdk/lib/_internal/libraries.dart

Index: sdk/lib/_internal/libraries.dart
diff --git a/sdk/lib/_internal/libraries.dart b/sdk/lib/_internal/libraries.dart
index 979bba75a36c4b0c8a52c49356fcc83a57418a42..7135991af4687497312b3bfb4e4568ac219deb11 100644
--- a/sdk/lib/_internal/libraries.dart
+++ b/sdk/lib/_internal/libraries.dart
@@ -106,12 +106,6 @@ const Map<String, LibraryInfo> LIBRARIES = const {
       maturity: Maturity.STABLE,
       dart2jsPath: "typed_data/dart2js/typed_data_dart2js.dart"),
 
-  "_native_typed_data": const LibraryInfo(
-      "typed_data/dart2js/native_typed_data_dart2js.dart",
-      category: "Internal",
-      maturity: Maturity.STABLE,
-      platforms: DART2JS_PLATFORM),
-
   "svg": const LibraryInfo(
       "svg/dartium/svg_dartium.dart",
       category: "Client",
@@ -303,3 +297,4 @@ class Maturity {
   static const Maturity UNSPECIFIED = const Maturity(-1, "Unspecified",
     "The maturity for this library has not been specified.");
 }
+