Remove legacy DownloadHooks as no longer used.

R=andybons@chromium.org,jbudorick@chromium.org
BUG=579176

Review URL: https://codereview.chromium.org/1763153002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299295 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -1575,9 +1575,6 @@ def DownloadGerritHook(force):
                    'into .git/hooks/commit-msg and '
                    'chmod +x .git/hooks/commit-msg' % src)
 
-# TODO(tandrii): remove this once repos which call this method directly are
-# upgraded. See http://crbug.com/579176.
-DownloadHooks = DownloadGerritHook
 
 
 def GetRietveldCodereviewSettingsInteractively():