Fix git-crup errors when CDPATH is set.

Review URL: https://chromiumcodereview.appspot.com/12320043

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@184148 0039d316-1c4b-4281-b951-d872f2087c98

crup-runner.sh

@@ -77,7 +77,7 @@ fi
 set -o pipefail
 dir="$1"
 solution="${1%%/*}"
-cd "$solution"
+cd "$solution" 1>/dev/null
 
 if [ "$solution" = "$1" ]; then
   # Skip git checkouts not managed by crup.