Fix python scripts in src/chrome/

chrome/tools/process_dumps_linux.py

-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """A tool to collect crash signatures for Chrome builds on Linux."""
 
 import fnmatch
 import optparse
 import os
 import shutil
@@ skipping 246 matching lines @@
     print GetStackTrace(processor_bin, temp_dir, processed_dump_file)
     print
     os.remove(processed_dump_file)
     dump_count += 1
 
   shutil.rmtree(temp_dir)
   print '%s dumps found' % dump_count
   return 0
 
 
-if '__main__' == __name__:
+def main():
+  if not sys.platform.startswith('linux'):
+    return 1
   parser = optparse.OptionParser()
   parser.add_option('', '--processor-dir', type='string', default='',
                     help='The directory where the processor is installed. '
                          'The processor is used to get stack trace from dumps. '
                           'Searches $PATH by default')
   parser.add_option('', '--dump-file', type='string', default='',
                     help='The path of the dump file to be processed. '
                          'Overwrites dump-path.')
   parser.add_option('', '--dump-dir', type='string', default='',
                     help='The directory where dump files are stored. '
                          'Searches this directory if dump-file is not '
                          'specified. Default is the Chromium crash directory.')
   parser.add_option('', '--symbol-dir', default='',
                     help='The directory with the symbols file. [Required]')
   parser.add_option('', '--symbol-filename', default='',
                     help='The name of the symbols file to use.  '
                          'This argument overrides --architecture.')
   parser.add_option('', '--architecture', type='int', default=None,
                     help='Override automatic x86/x86-64 detection. '
                          'Valid values are 32 and 64')
   parser.add_option('', '--sym-module-name', type='string', default='chrome',
                     help='The module name for the symbol file.  '
                          'Default: chrome')
 
   (options, args) = parser.parse_args()
+  return main_linux(options, args)
 
-  if sys.platform.startswith('linux'):
-    sys.exit(main_linux(options, args))
-  else:
-    sys.exit(1)
+
+if '__main__' == __name__:
+  sys.exit(main())