Revert "Handle fields with initializers in constant constructors."

pkg/compiler/lib/src/resolution/constructors.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.resolution.constructors;
 
 import '../common.dart';
 import '../common/resolution.dart' show Feature;
 import '../compiler.dart' show Compiler;
 import '../constants/constructors.dart'
@@ skipping 430 matching lines @@
           return null;
         }
       } else {
         reporter.reportErrorMessage(link.head, MessageKind.INVALID_INITIALIZER);
       }
     }
     if (!resolvedSuper) {
       constructorInvocation = resolveImplicitSuperConstructorSend();
     }
     if (isConst && isValidAsConstant) {
-      constructor.enclosingClass.forEachInstanceField((_, FieldElement field) {
-        if (!fieldInitializers.containsKey(field)) {
-          visitor.resolution.ensureResolved(field);
-          // TODO(johnniwinther): Report error if `field.constant` is `null`.
-          if (field.constant != null) {
-            fieldInitializers[field] = field.constant;
-          } else {
-            isValidAsConstant = false;
-          }
-        }
-      });
-      if (isValidAsConstant) {
-        constructor.constantConstructor = new GenerativeConstantConstructor(
-            constructor.enclosingClass.thisType,
-            defaultValues,
-            fieldInitializers,
-            constructorInvocation);
-      }
+      constructor.constantConstructor = new GenerativeConstantConstructor(
+          constructor.enclosingClass.thisType,
+          defaultValues,
+          fieldInitializers,
+          constructorInvocation);
     }
     visitor.scope = oldScope;
     return null; // If there was no redirection always return null.
   }
 }
 
 class ConstructorResolver extends CommonResolverVisitor<ConstructorResult> {
   final ResolverVisitor resolver;
   final bool inConstContext;
 
@@ skipping 409 matching lines @@
     // constructors.
     return null;
   }
   // TODO(johnniwinther): Use [Name] for lookup.
   ConstructorElement constructor = cls.lookupConstructor(constructorName);
   if (constructor != null) {
     constructor = constructor.declaration;
   }
   return constructor;
 }