upload_prebuilts: convert to print function

No real changes here.

BUG=chromium:377211
TEST=`./buildbot/run_tests` passes

Change-Id: I821238145cda5379f26a6b129417902800eaa109
Reviewed-on: https://chromium-review.googlesource.com/201375
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/upload_prebuilts.py b/scripts/upload_prebuilts.py
index 8bea5b3..28a39dd 100644
--- a/scripts/upload_prebuilts.py
+++ b/scripts/upload_prebuilts.py
@@ -18,6 +18,8 @@
 upload_prebuilts -b x86-dogfood -p /b/cbuild/build/ -u gs://chromeos-prebuilt -g
 """
 
+from __future__ import print_function
+
 import datetime
 import multiprocessing
 import os
@@ -112,7 +114,7 @@
     file_var, file_val = line.split('=')
     if file_var == key:
       found = True
-      print 'Updating %s=%s to %s="%s"' % (file_var, file_val, key, value)
+      print('Updating %s=%s to %s="%s"' % (file_var, file_val, key, value))
       value = '"%s"' % value
       file_lines.append(keyval_str % {'key': key, 'value': value})
     else:
@@ -142,7 +144,7 @@
   description = '%s: updating %s' % (os.path.basename(filename),
                                      ', '.join(data.keys()))
   # UpdateLocalFile will print out the keys/values for us.
-  print 'Revving git file %s' % filename
+  print('Revving git file %s' % filename)
 
   try:
     git.CreatePushBranch(prebuilt_branch, cwd)