Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/dump_info.dart

 // Copyright (c) 2013, 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 dump_info;
 
 import 'dart:convert' show
     HtmlEscape,
     JsonEncoder,
     StringConversionSink,
     ChunkedConversionSink;
 
 import 'elements/elements.dart';
 import 'elements/visitor.dart';
 import 'dart2jslib.dart' show
     Backend,
     CodeBuffer,
     Compiler,
-    CompilerTask;
+    CompilerTask,
+    MessageKind;
 import 'types/types.dart' show TypeMask;
 import 'deferred_load.dart' show OutputUnit;
 import 'js_backend/js_backend.dart' show JavaScriptBackend;
 import 'js_emitter/full_emitter/emitter.dart' as full show Emitter;
 import 'js/js.dart' as jsAst;
-import 'messages.dart' show MessageKind;
 import 'universe/universe.dart' show Selector, UniverseSelector;
 import 'util/util.dart' show NO_LOCATION_SPANNABLE;
 
 /// Maps objects to an id.  Supports lookups in
 /// both directions.
 class IdMapper<T>{
   Map<int, T> _idToElement = {};
   Map<T, int> _elementToId = {};
   int _idCounter = 0;
   final String name;
@@ skipping 603 matching lines @@
       encoder.startChunkedConversion(
           new StringConversionSink.fromStringSink(buffer));
     sink.add(outJson);
     compiler.reportInfo(
         NO_LOCATION_SPANNABLE,
         MessageKind.GENERIC,
         {'text': "View the dumped .info.json file at "
                  "https://dart-lang.github.io/dump-info-visualizer"});
   }
 }