Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

tests/compiler/dart2js/override_inheritance_test.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'compiler_helper.dart';
-import 'package:compiler/src/resolution/class_members.dart'
+import 'package:compiler/implementation/resolution/class_members.dart'
     show MembersCreator;
 
 main() {
   asyncTest(() => Future.wait([
     testRequiredParameters(),
     testPositionalParameters(),
     testNamedParameters(),
     testNotSubtype(),
     testGetterNotSubtype(),
     testSetterNotSubtype(),
@@ skipping 1518 matching lines @@
           class A {
             noSuchMethod(_) => null;
             method(); // testNoSuchMethod:13
           }
           class Class extends A {
           }
           """, warnings: MessageKind.UNIMPLEMENTED_METHOD_ONE,
                infos: MessageKind.UNIMPLEMENTED_METHOD_CONT),
   ]);
 }