Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart

 // Copyright (c) 2015, 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 dart2js.js_emitter.startup_emitter.model_emitter;
 
 import 'dart:convert' show JsonEncoder;
 
 import '../../common.dart';
 
@@ skipping 10 matching lines @@
 
 import '../../io/source_map_builder.dart' show
     SourceMapBuilder;
 
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
     Namer,
     ConstantEmitter;
 
-import '../../messages.dart' show MessageKind;
-
 import '../../util/util.dart' show
     NO_LOCATION_SPANNABLE;
 
 import '../../util/uri_extras.dart' show
     relativize;
 
 import '../headers.dart';
 import '../js_emitter.dart' show AstContainer, NativeEmitter;
 
 import 'package:js_runtime/shared/embedded_names.dart' show
@@ skipping 165 matching lines @@
     writeMainFragment(mainFragment, mainCode);
 
     if (backend.requiresPreamble &&
         !backend.htmlLibraryIsLoaded) {
       compiler.reportHint(NO_LOCATION_SPANNABLE, MessageKind.PREAMBLE);
     }
 
     if (compiler.deferredMapUri != null) {
       writeDeferredMap();
     }
-
+    
     // Return the total program size.
     return outputBuffers.values.fold(0, (a, b) => a + b.length);
   }
 
   /// Generates a simple header that provides the compiler's build id.
   js.Comment buildGeneratedBy() {
     String flavor = compiler.useContentSecurityPolicy
         ? 'fast startup, CSP'
         : 'fast startup';
     return new js.Comment(generatedBy(compiler, flavor: flavor));
@@ skipping 170 matching lines @@
     // Json does not support comments, so we embed the explanation in the
     // data.
     mapping["_comment"] = "This mapping shows which compiled `.js` files are "
         "needed for a given deferred library import.";
     mapping.addAll(compiler.deferredLoadTask.computeDeferredMap());
     compiler.outputProvider(compiler.deferredMapUri.path, 'deferred_map')
       ..add(const JsonEncoder.withIndent("  ").convert(mapping))
       ..close();
   }
 }