Add DownloadHooks as a no-op function to git_cl to unblock android bisectors.

BUG=600473

Review URL: https://codereview.chromium.org/1859873002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299688 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -2128,6 +2128,11 @@ def hasSheBang(fname):
     return f.read(2).startswith('#!')
 
 
+# TODO(bpastene) Remove once a cleaner fix to crbug.com/600473 presents itself.
+def DownloadHooks(*args, **kwargs):
+  pass
+
+
 def DownloadGerritHook(force):
   """Download and install Gerrit commit-msg hook.