Revert "dart2js: Do not emit type metadata for fields declared in non-reflectable classes."

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
index dad6b546f474a5fff5cb9a15b6daeaa4091ff9ed..dc1f7da028f625417cb7b05660134ce13b7311fc 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
@@ -161,14 +161,7 @@ class ClassEmitter extends CodeEmitterHelper {
             fieldCode = FIELD_CODE_CHARACTERS[code - FIRST_FIELD_CODE];
           }
         }
-        // Fields can only be reflected if their declaring class is reflectable
-        // (as they are only accessible via [ClassMirror.declarations]).
-        // However, set/get operations can be performed on them, so they are
-        // reflectable in some sense, which leads to [isAccessibleByReflection]
-        // reporting `true`.
-        if (backend.isAccessibleByReflection(fieldElement) &&
-            (fieldElement.isTopLevel ||
-             backend.isAccessibleByReflection(fieldElement.enclosingClass))) {
+        if (backend.isAccessibleByReflection(fieldElement)) {
           DartType type = fieldElement.type;
           reflectionMarker = '-${task.metadataCollector.reifyType(type)}';
         }