Move runtime js files down to lib/runtime/dart

lib/src/compiler.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.
 
 /// Command line tool to run the checker on a Dart program.
 library dev_compiler.src.compiler;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert' show JSON;
@@ skipping 502 matching lines @@
   // the compiler handles at compile time.
 ];
 
 /// Runtime files added to all applications when running the compiler in the
 /// command line.
 final defaultRuntimeFiles = () {
   var files = [
     'harmony_feature_check.js',
     'dart_utils.js',
     'dart_library.js',
-    '_errors.js',
-    '_generators.js',
-    '_types.js',
-    '_rtti.js',
-    '_classes.js',
-    '_operations.js',
-    'dart_runtime.js',
+    'dart/_errors.js',
+    'dart/_generators.js',
+    'dart/_types.js',
+    'dart/_rtti.js',
+    'dart/_classes.js',
+    'dart/_operations.js',
+    'dart/_runtime.js',
   ];
   files.addAll(corelibOrder.map((l) => l.replaceAll('.', '/') + '.js'));
   return files;
 }();
 
 final _log = new Logger('dev_compiler.src.compiler');