Added needed call to close() in _HexDigest.

build/win/copy_cdb_to_output.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 import hashlib
 import os
 import shutil
 import sys
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 src_build_dir = os.path.abspath(os.path.join(script_dir, os.pardir))
 sys.path.insert(0, src_build_dir)
 
 import vs_toolchain
 
 
 def _HexDigest(file_name):
   hasher = hashlib.sha256()
   afile = open(file_name, 'rb')
   blocksize = 65536
   buf = afile.read(blocksize)
   while len(buf) > 0:
     hasher.update(buf)
     buf = afile.read(blocksize)
+  afile.close()
   return hasher.hexdigest()
 
 
 def _CopyImpl(file_name, target_dir, source_dir, verbose=True):
   """Copy |source| to |target| if it doesn't already exist or if it
   needs to be updated.
   """
   target = os.path.join(target_dir, file_name)
   source = os.path.join(source_dir, file_name)
   if (os.path.isdir(os.path.dirname(target)) and
@@ skipping 38 matching lines @@
 def main():
   if len(sys.argv) < 2:
     print >>sys.stderr, 'Usage: copy_cdb_to_output.py <output_dir> ' + \
         '<target_arch>'
     return 1
   return _CopyCDBToOutput(sys.argv[1], sys.argv[2])
 
 
 if __name__ == '__main__':
   sys.exit(main())