Cleanup references to the old DDC repo

pkg/dev_compiler/lib/src/compiler/module_builder.dart

Index: pkg/dev_compiler/lib/src/compiler/module_builder.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/module_builder.dart b/pkg/dev_compiler/lib/src/compiler/module_builder.dart
index d321bd0181f2e4b2bf87824f99debd6e3aa475a8..415554a81ce7b21bda89328d94a4be835a314c55 100644
--- a/pkg/dev_compiler/lib/src/compiler/module_builder.dart
+++ b/pkg/dev_compiler/lib/src/compiler/module_builder.dart
@@ -238,7 +238,7 @@ class CommonJSModuleBuilder extends _ModuleBuilder {
       }
     }
 
-    // TODO(vsm): See https://github.com/dart-lang/dev_compiler/issues/512
+    // TODO(vsm): See https://github.com/dart-lang/sdk/issues/27309
     // This extra level of indirection should be unnecessary.
     var block =
         js.statement("(function() { 'use strict'; #; })()", [statements]);