Throw away everything in the go workspace except bin (2nd attempt).

build_apprtc_collider.py

 #!/usr/bin/python
 # 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.
 
 """Builds the AppRTC collider using the golang toolchain.
 
 The golang toolchain is downloaded by download_golang.py. We use that here
 to build the AppRTC collider server.
 """
@@ skipping 27 matching lines @@
   golang_env['PATH'] += os.pathsep + os.path.abspath('mercurial')
   subprocess.check_call([golang_path, 'get', 'collidermain'],
                         env=golang_env)
   subprocess.check_call([golang_path, 'build', 'collidermain'],
                         env=golang_env)
 
   # Delete everything in the workspace except the build artifacts.
   go_bin_dir = os.path.join(golang_workspace, 'bin')
   tmp_dir = tempfile.mkdtemp()
   shutil.move(go_bin_dir, tmp_dir)
-  shutil.rmtree(golang_workspace)
+  utils.RemoveDirectory(golang_workspace)
+  os.makedirs(golang_workspace)

[phoglund_chromium, 2016/02/10 08:01:19]

Oops! No, you're right, the move doesn't create dirs (but copytree does). Weird,
it worked locally for me. Thanks for the fix.

   shutil.move(os.path.join(tmp_dir, 'bin'), go_bin_dir)
   os.rmdir(tmp_dir)
 
 if __name__ == '__main__':
   sys.exit(main())