Migrate git-repo to create private changes rather than drafts

Considering that some users might expect changes created with
'-d' option are not public. Private changes may be a better
choice here than work-in-progress changes.

Change-Id: I46a8fb9ae38beb41cf96d6abe82bea6db2439669
diff --git a/project.py b/project.py
index 0b7baee..5e20951 100644
--- a/project.py
+++ b/project.py
@@ -175,14 +175,12 @@
 
   def UploadForReview(self, people,
                       auto_topic=False,
-                      draft=False,
                       private=False,
                       wip=False,
                       dest_branch=None):
     self.project.UploadForReview(self.name,
                                  people,
                                  auto_topic=auto_topic,
-                                 draft=draft,
                                  private=private,
                                  wip=wip,
                                  dest_branch=dest_branch)
@@ -1110,7 +1108,6 @@
   def UploadForReview(self, branch=None,
                       people=([], []),
                       auto_topic=False,
-                      draft=False,
                       private=False,
                       wip=False,
                       dest_branch=None):
@@ -1156,12 +1153,7 @@
     if dest_branch.startswith(R_HEADS):
       dest_branch = dest_branch[len(R_HEADS):]
 
-    upload_type = 'for'
-    if draft:
-      upload_type = 'drafts'
-
-    ref_spec = '%s:refs/%s/%s' % (R_HEADS + branch.name, upload_type,
-                                  dest_branch)
+    ref_spec = '%s:refs/for/%s' % (R_HEADS + branch.name, dest_branch)
     if auto_topic:
       ref_spec = ref_spec + '/' + branch.name