Merge CoreTypes and CoreClasses into CommonElements.

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 'package:js_runtime/shared/embedded_names.dart'
     show
@@ skipping 15 matching lines @@
         MANGLED_NAMES,
         METADATA,
         NATIVE_SUPERCLASS_TAG_NAME,
         STATIC_FUNCTION_NAME_TO_CLOSURE,
         TYPE_TO_INTERCEPTOR_MAP,
         TYPES;
 
 import '../../common.dart';
 import '../../compiler.dart' show Compiler;
 import '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
-import '../../core_types.dart' show CoreClasses;
+import '../../core_types.dart' show CommonElements;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
 import '../../hash/sha1.dart' show Hasher;
 import '../../io/code_output.dart';
 import '../../io/line_column_provider.dart'
     show LineColumnCollector, LineColumnProvider;
 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 '../../util/uri_extras.dart' show relativize;
@@ skipping 349 matching lines @@
     // 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.options.deferredMapUri.path, 'deferred_map')
       ..add(const JsonEncoder.withIndent("  ").convert(mapping))
       ..close();
   }
 }