Revert "Introduce the "Embedded" category."

pkg/compiler/lib/src/dart2js.dart

Index: pkg/compiler/lib/src/dart2js.dart
diff --git a/pkg/compiler/lib/src/dart2js.dart b/pkg/compiler/lib/src/dart2js.dart
index fa7aeb734416f54622013c9333148631401373e8..bc511e44b00d580dbc1c9953cf09a0022737466c 100644
--- a/pkg/compiler/lib/src/dart2js.dart
+++ b/pkg/compiler/lib/src/dart2js.dart
@@ -19,6 +19,7 @@ import 'filenames.dart';
 import 'util/uri_extras.dart';
 import 'util/util.dart' show stackTraceFilePrefix;
 import 'util/command_line.dart';
+import 'package:sdk_library_metadata/libraries.dart';
 import 'package:package_config/discovery.dart' show findPackages;
 
 const String LIBRARY_ROOT = '../../../../../sdk';
@@ -245,13 +246,21 @@ Future<api.CompilationResult> compile(List<String> argv) {
 
   setCategories(String argument) {
     List<String> categories = extractParameter(argument).split(',');
+    Set<String> allowedCategories =
+        LIBRARIES.values.map((x) => x.category).toSet();
+    allowedCategories.remove('Shared');
+    allowedCategories.remove('Internal');
+    List<String> allowedCategoriesList =
+        new List<String>.from(allowedCategories);
+    allowedCategoriesList.sort();
     if (categories.contains('all')) {
-      categories = ["Client", "Server"];
+      categories = allowedCategoriesList;
     } else {
+      String allowedCategoriesString = allowedCategoriesList.join(', ');
       for (String category in categories) {
-        if (!["Client", "Server"].contains(category)) {
+        if (!allowedCategories.contains(category)) {
           fail('Unsupported library category "$category", '
-               'supported categories are: Client, Server, all');
+               'supported categories are: $allowedCategoriesString');
         }
       }
     }