Remove the core library stubbing infrastructure.

tools/create_sdk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, 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.
 #
 # A script which will be invoked from gyp to create an SDK.
 #
 # Usage: create_sdk.py sdk_directory
 #
@@ skipping 215 matching lines @@
   # Create and copy tools.
   UTIL = join(SDK_tmp, 'util')
   os.makedirs(UTIL)
 
   RESOURCE = join(SDK_tmp, 'lib', '_internal', 'pub', 'asset')
   os.makedirs(os.path.dirname(RESOURCE))
   copytree(join(HOME, 'sdk', 'lib', '_internal', 'pub', 'asset'),
            join(RESOURCE),
            ignore=ignore_patterns('.svn'))
 
-  copytree(join(SNAPSHOT, 'core_stubs'),
-           join(RESOURCE, 'dart', 'core_stubs'))
-
   # Copy in 7zip for Windows.
   if HOST_OS == 'win32':
     copytree(join(HOME, 'third_party', '7zip'),
              join(RESOURCE, '7zip'),
              ignore=ignore_patterns('.svn'))
 
   # Copy dart2js/pub.
   CopyDartScripts(HOME, SDK_tmp)
   CopySnapshots(SNAPSHOT, SDK_tmp)
 
@@ skipping 11 matching lines @@
       f.write(revision + '\n')
       f.close()
 
   Copy(join(HOME, 'README.dart-sdk'), join(SDK_tmp, 'README'))
   Copy(join(HOME, 'sdk', 'api_readme.md'), join(SDK_tmp, 'lib', 'api_readme.md'))
 
   move(SDK_tmp, SDK)
 
 if __name__ == '__main__':
   sys.exit(Main())