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

utils/apidoc/apidoc.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.
 
 /**
  * This generates the reference documentation for the core libraries that come
  * with dart. It is built on top of dartdoc, which is a general-purpose library
  * for generating docs from any Dart code. This library extends that to include
  * additional information and styling specific to our standard library.
  *
  * Usage:
  *
  *     $ dart apidoc.dart [--out=<output directory>]
  */
 library apidoc;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'html_diff.dart';
 
 // TODO(rnystrom): Use "package:" URL (#4968).
-import '../../pkg/compiler/lib/src/mirrors/source_mirrors.dart';
-import '../../pkg/compiler/lib/src/mirrors/mirrors_util.dart';
-import '../../pkg/compiler/lib/src/filenames.dart';
+import '../../sdk/lib/_internal/compiler/implementation/mirrors/source_mirrors.dart';
+import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart';
+import '../../sdk/lib/_internal/compiler/implementation/filenames.dart';
 import '../../sdk/lib/_internal/dartdoc/lib/dartdoc.dart';
 import '../../sdk/lib/_internal/libraries.dart';
 import 'package:path/path.dart' as path;
 
 HtmlDiff _diff;
 
 void main(List<String> args) {
   int mode = MODE_STATIC;
   String outputDir = 'docs';
   bool generateAppCache = false;
@@ skipping 432 matching lines @@
     var memberName = '$typeName.${member.simpleName}';
     if (member is MethodMirror && member.isConstructor) {
       final separator = member.constructorName == '' ? '' : '.';
       memberName = 'new $typeName$separator${member.constructorName}';
     }
 
     return a(memberUrl(member), memberName);
   }
 }