Third step towards loading core library scripts directly from the sources

runtime/tools/gen_library_src_paths.py

 #!/usr/bin/env python
 # Copyright (c) 2013, 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.
 #
 # This python script creates a source path mapping in a C++ source file from
 # a C++ source template and list of dart library files.
 
 import os
 import sys
@@ skipping 20 matching lines @@
                  "{{LIBRARY_SOURCE_MAP}}",
                  ' "' + lib_name + '", "' +
                  os.path.abspath(string_file).replace('\\', '\\\\') + '", \n')
         inpt.close()
         if (main_file_found):
           continue
       part_index.append(' "' +
           os.path.basename(string_file).replace('\\', '\\\\') + '", ')
       part_index.append('"' +
           os.path.abspath(string_file).replace('\\', '\\\\') + '", \n')
+  bootstrap_cc_text = bootstrap_cc_text.replace("{{LIBRARY_SOURCE_MAP}}", '')
   bootstrap_cc_text = bootstrap_cc_text.replace("{{PART_SOURCE_MAP}}",
                                                 ''.join(part_index))
   open(output_file, 'w').write(bootstrap_cc_text)
   return True
 
 
 def main(args):
   try:
     # Parse input.
     parser = OptionParser()
@@ skipping 47 matching lines @@
 
     return 0
   except Exception, inst:
     sys.stderr.write('gen_library_src_paths.py exception\n')
     sys.stderr.write(str(inst))
     sys.stderr.write('\n')
     return -1
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))