sdk files reorganization to make dart2js a proper package

pkg/compiler/lib/src/library_loader.dart

Index: pkg/compiler/lib/src/library_loader.dart
diff --git a/pkg/compiler/lib/src/library_loader.dart b/pkg/compiler/lib/src/library_loader.dart
index a566d3f27d33b24bb5cb2e9152311f66648137da..20ef6d71a80df99f0210cc0344aa6afabd332bd5 100644
--- a/pkg/compiler/lib/src/library_loader.dart
+++ b/pkg/compiler/lib/src/library_loader.dart
@@ -102,9 +102,9 @@ import 'util/util.dart' show
  * 'dart:core' and 'dart:_js_helper' are not readable themselves but are instead
  * resolved into a readable URI using the library root URI provided from the
  * command line and the list of platform libraries found in
- * 'sdk/lib/_internal/libraries.dart'. This is done through the
- * [Compiler.translateResolvedUri] method which checks whether a library by that
- * name exists and in case of internal libraries whether access is granted.
+ * 'sdk/lib/_internal/libraries_spec/lib/libraries.dart'. This is done through
+ * the [Compiler.translateResolvedUri] method which checks whether a library by
+ * that name exists and in case of internal libraries whether access is granted.
  *
  * ## Resource URI ##
  *