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 cb6e7b2242db8cdb29c12f0420d67df42147dee3..fd6e338d040f9204e2f2c14f5c223afe26ac651e 100644
--- a/sdk/lib/_internal/libraries.dart
+++ b/sdk/lib/_internal/libraries.dart
@@ -106,13 +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",
-      implementation: true,
-      documented: false,
-      platforms: DART2JS_PLATFORM),
-
   "svg": const LibraryInfo(
       "svg/dartium/svg_dartium.dart",
       category: "Client",
@@ -304,3 +297,4 @@ class Maturity {
   static const Maturity UNSPECIFIED = const Maturity(-1, "Unspecified",
     "The maturity for this library has not been specified.");
 }
+