codereview: consistent indent, cut dead code

End the charade (farce?) that we are using upload.py unaltered.
Cut all the unused stuff.
Indent using tabs to match the rest of the file.

Next: rewrite MercurialVCS to use mercurial package,
to avoid overhead of forking off a new hg command
multiple times for every file.  And parallelize upload.

R=gri
CC=golang-dev
https://golang.org/cl/2009046