Start running post-upload hooks again

This was a typo, I accidentally removed the RUN_POST_UPLOAD_HOOKS
line (which still has a function) when I meant to remove the
TRY_ON_UPLOAD line (which doesn't). I blame them both containing
the word 'UPLOAD'.

Bug: 746079
Change-Id: I007ed90443680a7f3741367b368c55e5056e3252
Reviewed-on: https://chromium-review.googlesource.com/576530Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487875}

codereview.settings

@@ -5,5 +5,5 @@ GERRIT_HOST: True
 CC_LIST: chromium-reviews@chromium.org
 VIEW_VC: https://chromium.googlesource.com/chromium/src/+/
 STATUS: http://chromium-status.appspot.com/status
-TRY_ON_UPLOAD: True
+RUN_POST_UPLOAD_HOOK: True
 LINT_IGNORE_REGEX: webkit/api/.*