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

tests/compiler/dart2js/check_elements_invariants_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:compiler/implementation/apiimpl.dart';
-import 'package:compiler/implementation/dart2jslib.dart' show NullSink;
+import 'package:compiler/src/apiimpl.dart';
+import 'package:compiler/src/dart2jslib.dart' show NullSink;
 import 'package:expect/expect.dart';
-import 'package:compiler/implementation/filenames.dart';
-import 'package:compiler/implementation/source_file_provider.dart';
-import 'package:compiler/implementation/elements/elements.dart'
+import 'package:compiler/src/filenames.dart';
+import 'package:compiler/src/source_file_provider.dart';
+import 'package:compiler/src/elements/elements.dart'
     show ClassElement;
-import 'package:compiler/implementation/resolution/class_members.dart'
+import 'package:compiler/src/resolution/class_members.dart'
     show ClassMemberMixin;
 import "package:async_helper/async_helper.dart";
 
 
 const String DART2JS_SOURCE =
-    'sdk/lib/_internal/compiler/implementation/dart2js.dart';
+    'pkg/compiler/lib/src/dart2js.dart';
 const List<String> DART2JS_OPTIONS = const <String>[
-      '--categories=Client,Server', 
+      '--categories=Client,Server',
       '--disable-type-inference'
     ];
 
 Iterable<ClassElement> computeLiveClasses(Compiler compiler) {
   return new Set<ClassElement>()
       ..addAll(compiler.resolverWorld.instantiatedClasses)
       ..addAll(compiler.codegenWorld.instantiatedClasses);
 }
 
 void checkClassInvariants(ClassElement cls) {
@@ skipping 17 matching lines @@
      Expect.isTrue(passed, "Compilation of dart2js failed.");
 
      computeLiveClasses(compiler).forEach(checkClassInvariants);
    });
 }
 
 void main () {
   var uri = currentDirectory.resolve(DART2JS_SOURCE);
   asyncTest(() => checkElementInvariantsAfterCompiling(uri));
 }