Introduce "platform configurations" to replace categories and libraries.dart.

tests/compiler/dart2js/categories_test.dart

Index: tests/compiler/dart2js/categories_test.dart
diff --git a/tests/compiler/dart2js/categories_test.dart b/tests/compiler/dart2js/categories_test.dart
index 3b22453112ca073a27266c86ad772165cf6b10ed..677d1a83a60cefe2c506ea6cc37cd7f6a51acd15 100644
--- a/tests/compiler/dart2js/categories_test.dart
+++ b/tests/compiler/dart2js/categories_test.dart
@@ -19,17 +19,13 @@ runTest(String source, String categories, int expectedErrors) async {
 
 void main() {
   asyncTest(() async {
-    await runTest("import 'dart:async'; main() {}", "Embedded", 1);

[Johnni Winther, 2015/10/30 10:38:39]

We should test this on core_embedded.dart using a dart_embedded.platform
specification.

[sigurdm, 2015/10/30 11:38:27]

I actually did not mean to commit core_embedded.dart. It was created as an
experiment
It does not work with the js backend, as the patches are not matching.

I have removed the core_embedded, it should live in the fletch repo - there
should also be a test.

     await runTest("import 'dart:async'; main() {}", "Client", 0);
     await runTest("import 'dart:async'; main() {}", "Server", 0);
-    await runTest("import 'dart:html'; main() {}", "Embedded", 1);
     await runTest("import 'dart:html'; main() {}", "Client", 0);
     await runTest("import 'dart:html'; main() {}", "Server", 1);
-    await runTest("import 'dart:io'; main() {}", "Embedded", 1);
     await runTest("import 'dart:io'; main() {}", "Client", 1);
     await runTest("import 'dart:io'; main() {}", "Server", 0);
-    await runTest("import 'dart:_internal'; main() {}", "Embedded", 2);
-    await runTest("import 'dart:_internal'; main() {}", "Client", 2);
-    await runTest("import 'dart:_internal'; main() {}", "Server", 2);
+    await runTest("import 'dart:_internal'; main() {}", "Client", 1);
+    await runTest("import 'dart:_internal'; main() {}", "Server", 1);
   });
 }