Remove dartc optimizing backend.

dart/compiler/scripts/generate_my_projects.py

 #!/usr/bin/env python
 # Copyright (c) 2011, 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.
 
 import os
 import sys
 
 
 def Main():
@@ skipping 43 matching lines @@
   if exit_code:
     return exit_code
 
   exit_code = os.system("python %(compiler)s/generate_source_list.py "
                         "compiler_corelib "
                         "%(compiler)s/compiler_corelib_sources "
                         "lib" % locations)
   if exit_code:
     return exit_code
 
-  exit_code = os.system("python %(compiler)s/generate_source_list.py "
-                        "closure_compiler_src %(compiler)s/closure_compiler_sources "
-                        "../third_party/closure_compiler_src "
-                        "build javadoc test"
-                        % locations)
-  if exit_code:
-    return exit_code
-
   if '--no-gyp' in sys.argv:
     print '--no-gyp is deprecated.'
 
   return exit_code
 
 
 if __name__ == '__main__':
   sys.exit(Main())