Update style according to advice from pylint.

tools/auto_bisect/fetch_build.py

 # Copyright 2014 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.
 
 """This module contains functions for fetching and extracting archived builds.
 
 The builds may be stored in different places by different types of builders;
 for example, builders on tryserver.chromium.perf stores builds in one place,
 while builders on chromium.linux store builds in another.
 
@@ skipping 111 matching lines @@
 
     Args:
       revision: A git commit hash or other revision string.
       deps_patch_sha: SHA1 hash of a DEPS file patch.
 
     Returns:
       The archive file name.
     """
     base_name = 'full-build-%s' % self._PlatformName()
     if deps_patch_sha:
-      revision = '%s_%s' % (revision , deps_patch_sha)
+      revision = '%s_%s' % (revision, deps_patch_sha)
     return '%s_%s.zip' % (base_name, revision)
 
   def _PlatformName(self):
     """Return a string to be used in paths for the platform."""
     if self._platform in ('win', 'win64'):
       # Build archive for win64 is still stored with "win32" in the name.
       return 'win32'
     if self._platform in ('linux', 'android'):
       # Android builds are also stored with "linux" in the name.
       return 'linux'
@@ skipping 114 matching lines @@
       (bisect_utils.IsMacHost()
        and os.path.getsize(filename) < mac_zip_size_limit)):
     unzip_command = ['unzip', '-o']
     _UnzipUsingCommand(unzip_command, filename, output_dir)
     return
 
   # On Windows, try to use 7z if it is installed, otherwise fall back to the
   # Python zipfile module. If 7z is not installed, then this may fail if the
   # zip file is larger than 512MB.
   sevenzip_path = r'C:\Program Files\7-Zip\7z.exe'
-  if (bisect_utils.IsWindowsHost() and os.path.exists(sevenzip_path)):
+  if bisect_utils.IsWindowsHost() and os.path.exists(sevenzip_path):
     unzip_command = [sevenzip_path, 'x', '-y']
     _UnzipUsingCommand(unzip_command, filename, output_dir)
     return
 
   _UnzipUsingZipFile(filename, output_dir, verbose)
 
 
 def _UnzipUsingCommand(unzip_command, filename, output_dir):
   """Extracts a zip file using an external command.
 
@@ skipping 70 matching lines @@
       deps_patch_sha=args.deps_patch_sha)
 
   print 'Build has been downloaded to and extracted in %s.' % args.output_dir
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))