Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/patch_parser.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 library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 101 matching lines @@
  *   element.
  */
 
 library patchparser;
 
 import 'dart:async';
 
 import 'constants/values.dart' show ConstantValue;
 import 'dart2jslib.dart'
     show Compiler,
-         CompilerTask;
-import 'diagnostic_listener.dart';
+         CompilerTask,
+         DiagnosticListener,
+         MessageKind,
+         Script;
 import 'elements/elements.dart';
 import 'elements/modelx.dart'
     show BaseFunctionElementX,
          ClassElementX,
          GetterElementX,
          LibraryElementX,
          MetadataAnnotationX,
          SetterElementX;
-import 'messages.dart' show MessageKind;
 import 'library_loader.dart' show LibraryLoader;
 import 'scanner/scannerlib.dart';  // Scanner, Parsers, Listeners
-import 'script.dart';
 import 'util/util.dart';
 
 class PatchParserTask extends CompilerTask {
   final String name = "Patching Parser";
 
   PatchParserTask(Compiler compiler): super(compiler);
 
   /**
    * Scans a library patch file, applies the method patches and
    * injections to the library, and returns a list of class
@@ skipping 424 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }