Early exit auto-update when running as root.

Otherwise it can mess with file permissions.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7016002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@85178 0039d316-1c4b-4281-b951-d872f2087c98

update_depot_tools

@@ -5,6 +5,12 @@
 
 # This script will try to sync the bootstrap directories and then defer control.
 
+if [ "$USER" == "root" ];
+then
+  echo Running depot tools as root is sad.
+  exit
+fi
+
 base_dir=$(dirname "$0")
 if [ -L "$base_dir" ]
 then