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

tests/utils/source_mirrors_test.dart

 // Copyright (c) 2012, 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.
 // VMOptions=
 // VMOptions=--print-object-histogram
 
 // Smoke test of the dart2js compiler API.
 library source_mirrors_test;
 
 import 'dart:async';
 import "package:async_helper/async_helper.dart";
 
-import 'package:compiler/implementation/mirrors/analyze.dart';
+import 'package:compiler/src/mirrors/analyze.dart';
 import 'dummy_compiler_test.dart';
 
 main() {
   asyncStart();
   Future result =
       analyze([new Uri(scheme: 'main')],
               new Uri(scheme: 'lib', path: '/'),
               new Uri(scheme: 'package', path: '/'),
               provider, handler);
   result.then((mirrorSystem) {
     if (mirrorSystem == null) {
       throw 'Analysis failed';
     }
     mirrorSystem.libraries.forEach((uri, library) {
       print(library);
       library.declarations.forEach((name, declaration) {
         print(' $name:$declaration');
       });
     });
   }, onError: (e, s) {
       throw 'Analysis failed: $e\n$s';
   }).then(asyncSuccess);
 }