Fix apply_fixits.py to always read from stdin.

tools/clang/scripts/apply_fixits.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 #
 # Script to apply fixits generated by clang. This is to work around the fact
 # that clang's -Xclang -fixit-recompile flag, which automatically applies fixits
 # and recompiles, doesn't work well with parallel invocations of clang.
 #
 # Usage:
@@ skipping 30 matching lines @@
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument(
       'build_directory',
       nargs='?',
       default='out/Debug',
       help='path to the build directory to complete relative paths in fixits')
   args = parser.parse_args()
 
   fixits = collections.defaultdict(list)
-  for line in fileinput.input():
+  for line in fileinput.input(['-']):
     if not line.startswith('fix-it:'):
       continue
     m = _FIXIT_RE.match(line)
     if not m:
       continue
     # The negative line numbers are a cheap hack so we can sort things in line
     # order but reverse column order. Applying the fixits in reverse order makes
     # things simpler, since offsets won't have to be adjusted as the text is
     # changed.
     fixits[m.group('file')].append(FixIt(
@@ skipping 17 matching lines @@
         line = lines[fixit.start_line - 1]
         lines[fixit.start_line - 1] = (line[:-fixit.start_col - 1] + fixit.text
                                        + line[-fixit.end_col - 1:])
       f.seek(0)
       f.truncate()
       f.writelines(lines)
 
 
 if __name__ == '__main__':
   sys.exit(main())