Dart: Renames dart:mojo_blah -> mojo:blah

mojo/dart/embedder/builtin.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library mojo_builtin;
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:_internal';
-import 'dart:mojo_core';
+//import 'dart:_internal';
+import 'mojo:core';
 // import 'root_library'; happens here from C Code
 
 // The root library (aka the script) is imported into this library. The
 // embedder uses this to lookup the main entrypoint in the root library's
 // namespace.
 Function _getMainClosure() => main;
 
 
 // Corelib 'print' implementation.
 void _print(arg) {
@@ skipping 220 matching lines @@
     //   _loadScript(tag, uri, libraryUri, data);
     // });
     throw 'Cannot load http, yet.';
   } else {
     // Mojo does not expose any asynchronous file IO calls, but we'll maintain
     // the same structure as the standalone embedder here in case it ever does.
     var data = readSync(resourceUri.toFilePath());
     _loadScript(tag, uri, libraryUri, data);
   }
 }