[milo] remove unused code.

milo/client/cmd/backfill/README.md

Index: milo/client/cmd/backfill/README.md
diff --git a/milo/client/cmd/backfill/README.md b/milo/client/cmd/backfill/README.md
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index b82a7e2d0cf8fa5bea0dfd476f896ead2f66566f..0000000000000000000000000000000000000000
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-## Usage
-
-Run `backfill <command>`! You can `backfill help git` for more detailed
-docs for each command.
-
-### git
-
-The `git` subcommand reads output from git log and writes the results to the
-Revision entity group in datastore, including generation numbers. The git log
-should be generated from running:
-`git log --topo-order --reverse -z --format=format:'%H,%P,%ae,%ct,%b'`
-
-This should be done from a clone without local edits.
-
-## Enabling remote API
-You need to deploy some module to app engine which has the remote api enabled
-in order for this backfiller to work successfully.
-Full docs here: https://cloud.google.com/appengine/docs/go/tools/remoteapi
-
-You *should* be able to just `goapp deploy` in `/milo/appengine/remote_api`,
-and then do `backfill buildbot -remoteURL
-remote-api-1-dot-luci-milo.appspot.com`, or something like that.