dart2js: move native boilerplate code into a separate file.

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

 // Copyright (c) 2014, 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.new_js_emitter.model_emitter;
 
 import '../../dart2jslib.dart' show Compiler;
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
@@ skipping 120 matching lines @@
     }
 
     if (globals.isEmpty) return new js.Block.empty();
 
     js.ObjectInitializer globalsObject = new js.ObjectInitializer(globals);
 
     List<js.Statement> statements =
         [new js.ExpressionStatement(
             new js.VariableDeclarationList(
                 [new js.VariableInitialization(
-                    new js.VariableDeclaration(r"init", allowRename: false),
+                    new js.VariableDeclaration("init", allowRename: false),
                     globalsObject)]))];
     return new js.Block(statements);
   }
 
   List<js.Property> emitLoadUrisAndHashes(Map<String, List<Output>> loadMap) {
     js.ArrayInitializer outputUris(List<Output> outputs) {
       return js.stringArray(outputs.map((DeferredOutput output) =>
           "${output.outputFileName}$deferredExtension"));
     }
     js.ArrayInitializer outputHashes(List<Output> outputs) {
@@ skipping 392 matching lines @@
 
   var end = Date.now();
   print('Setup: ' + (end - start) + ' ms.');
 
   #main();  // Start main.
 
 }(Date.now(), #code)
 }""";
 
 }