Move JSSyntaxRegExp to core as a private member. This removes the last refrences to dart:coreimpl.

tools/testing/legpad/legpad.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.
 
 """
 Legpad is used to compile .dart files to javascript, using the dart2js compiler.
 
 This is accomplished by creating an html file (usually called
@@ skipping 106 matching lines @@
 #   match.group(2) = url of file being imported
 DIRECTIVE_RE = re.compile(r"^#(import|source|native)\([\"']([^\"']*)[\"']")
 
 # id of script tag that holds name of the top dart file to be compiled,
 # (This file name passed will be passed to the leg compiler by legpad.dart.)
 MAIN_ID = "main_id"
 
 # TODO(mattsh): read this from some config file once ahe/zundel create it
 DART_LIBRARIES = {
     "core": "lib/compiler/implementation/lib/core.dart",
-    "coreimpl": "lib/compiler/implementation/lib/coreimpl.dart",
     "_js_helper": "lib/compiler/implementation/lib/js_helper.dart",
     "_interceptors": "lib/compiler/implementation/lib/interceptors.dart",
     "dom": "lib/dom/frog/dom_frog.dart",
     "html": "lib/html/frog/html_frog.dart",
     "io": "lib/compiler/implementation/lib/io.dart",
     "isolate": "lib/isolate/isolate_leg.dart",
     "json": "lib/json/json.dart",
     "uri": "lib/uri/uri.dart",
     "utf": "lib/utf/utf.dart",
 }
@@ skipping 221 matching lines @@
     raise CommandFailedException(msg)
   logging.debug("SUCCEEDED (%d bytes)" % len(stdout))
   return stdout
 
 
 def main(argv):
   Pad(argv)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))