Invoke the bash shell via /usr/bin/env so that these scripts run on operating systems without /bin/bash too.

TEST=run "git cl owners" on FreeBSD
BUG=

Review URL: https://codereview.chromium.org/197213008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@274320 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/man/src/git-freeze.demo.1.sh b/man/src/git-freeze.demo.1.sh
index 397d183..82a0f1f 100755
--- a/man/src/git-freeze.demo.1.sh
+++ b/man/src/git-freeze.demo.1.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 . demo_repo.sh
 
 add deleted_file