Move description of win/setup_toolchain.py before import.

build/toolchain/win/setup_toolchain.py

 # Copyright (c) 2013 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 errno
-import os
-import re
-import subprocess
-import sys
-
+#
 # Copies the given "win tool" (which the toolchain uses to wrap compiler
 # invocations) and the environment blocks for the 32-bit and 64-bit builds on
 # Windows to the build directory.
 #
 # The arguments are the visual studio install location and the location of the
 # win tool. The script assumes that the root build directory is the current dir
 # and the files will be written to the current directory.
 
+import errno
+import os
+import re
+import subprocess
+import sys
+
 
 def _ExtractImportantEnvironment(output_of_set):
   """Extracts environment variables required for the toolchain to run from
   a textual dump output by the cmd.exe 'set' command."""
   envvars_to_save = (
       'goma_.*', # TODO(scottmg): This is ugly, but needed for goma.
       'include',
       'lib',
       'libpath',
       'path',
@@ skipping 116 matching lines @@
     env_block = _FormatAsEnvironmentBlock(env)
     with open('environment.' + arch, 'wb') as f:
       f.write(env_block)
 
   assert vc_bin_dir
   print 'vc_bin_dir = "%s"' % vc_bin_dir
 
 
 if __name__ == '__main__':
   main()