Revert "Introduce the "Embedded" category."

tests/compiler/dart2js/embedded_category_api_boundary_test.dart

-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE.md file.
-
-/// Tests that analyzing everything from the libraries that are public from the
-/// embedded category does not cause elements from other libraries to be
-/// processed.
-library embedded_category_boundary_test;
-
-import 'package:expect/expect.dart';
-import 'package:async_helper/async_helper.dart';
-import 'package:compiler/src/compiler.dart';
-import 'package:compiler/src/elements/elements.dart';
-import 'package:sdk_library_metadata/libraries.dart';
-
-import 'analyze_helper.dart';
-
-main() async {
-  List<Uri> uriList = new List<Uri>();
-  libraries.forEach((String name, LibraryInfo info) {
-    if (info.categories.contains(Category.embedded)) {
-      uriList.add(new Uri(scheme: 'dart', path: name));
-    }
-  });
-  asyncTest(() async {
-    analyze(uriList, {},
-        checkResults: checkResults, analyzeMain: true, analyzeAll: false);
-  });
-}
-
-/// These elements are currently escaping from dart:async via
-/// `core._Resource#_readAsStream`.
-Set<String> whiteList = new Set.from([
-  "function(StreamController#addError)",
-  "getter(StreamController#stream)",
-  "setter(StreamController#onListen)"
-]);
-
-bool checkResults(Compiler compiler, CollectingDiagnosticHandler handler) {
-  return compiler.enqueuer.resolution.processedElements
-      .every((Element element) {
-    if (whiteList.contains("$element")) return true;
-    LibraryInfo info = libraries[element.library.canonicalUri.path];
-    bool isAllowedInEmbedded =
-        info.isInternal || info.categories.contains(Category.embedded);
-    return isAllowedInEmbedded;
-  });
-}