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/git-map b/git-map
index b3399c0..3e651c7 100755
--- a/git-map
+++ b/git-map
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -6,4 +6,4 @@
 # git_map.py -- a git-command for presenting a graphical view of the git
 # history.
 
-. $(type -P python_git_runner.sh) | less -R
\ No newline at end of file
+. $(type -P python_git_runner.sh) | less -R