Emit declarations for typedefs that are needed by reflection.

sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart
index 89fdfa6622a0a1097cf5860afc9c809f653c2f16..92b5f552bf72b92f83134e35709e5d669a0bd5dd 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/metadata_emitter.dart
@@ -90,20 +90,8 @@ class MetadataEmitter extends CodeEmitterHelper {
   }
 
   void emitMetadata(CodeBuffer buffer) {
-    var literals = backend.typedefTypeLiterals.toList();
-    Elements.sortedByPosition(literals);
-    var properties = [];
-    for (TypedefElement literal in literals) {
-      var key = namer.getNameX(literal);
-      var value = js.number(reifyType(literal.rawType));
-      properties.add(new jsAst.Property(js.string(key), value));
-    }
-    var map = new jsAst.ObjectInitializer(properties);
-    buffer.write(
-        jsAst.prettyPrint(
-            js.statement('init.functionAliases = #', map), compiler));
-    buffer.write('${N}init.metadata$_=$_[');
-    for (var metadata in globalMetadata) {
+    buffer.write('init.metadata$_=$_[');
+    for (String metadata in globalMetadata) {
       if (metadata is String) {
         if (metadata != 'null') {
           buffer.write(metadata);