Add an assert to ensure UTF-8 locale when handling file paths.

client/tools/zip_profiler.py

 #!/usr/bin/env python
 # Copyright 2013 The Swarming Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0 that
 # can be found in the LICENSE file.
 
 """Profiler to compare various compression levels with regards to speed
 and final size when compressing the full set of files from a given
 isolated file.
 """
 
 import bz2
 import optparse
 import os
-import shutil
 import subprocess
 import sys
 import tempfile
 import time
 import zlib
 
 ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 sys.path.insert(0, ROOT_DIR)
 
+from third_party.depot_tools import fix_encoding
+from utils import file_path
 from utils import tools
 
 
 def zip_file(compressor_constructor, compression_level, filename):
   compressed_size = 0
   compressor = compressor_constructor(compression_level)
   with open(filename, 'rb') as f:
     while True:
       chunk = f.read(16 * 1024)
       if not chunk:
@@ skipping 75 matching lines @@
     else:
       print('Number of files: %s' % len(file_set))
       print('Total size: %s' % sum(file_set.itervalues()))
 
       # Profile!
       profile_compress('zlib', zlib.compressobj, range(10), zip_directory,
                        temp_dir)
       profile_compress('bz2', bz2.BZ2Compressor, range(1, 10), zip_directory,
                        temp_dir)
   finally:
-    shutil.rmtree(temp_dir)
+    file_path.rmtree(temp_dir)
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   sys.exit(main())