Revert r166268 "In msys-git-1.7.4, in git-cl $0 is:"

/usr/local/google/home/gspencer/depot/depot_tools/git-cl: line 22:
/usr/local/google/home/gspencer/depot/depot_tools/git-cl/git_cl.py: Not a directory
/usr/local/google/home/gspencer/depot/depot_tools/git-cl: line 22: exec:
/usr/local/google/home/gspencer/depot/depot_tools/git-cl/git_cl.py: cannot execute: Not a directory

TBR=szager@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11366117

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@166274 0039d316-1c4b-4281-b951-d872f2087c98

git-cl

@@ -6,7 +6,7 @@
 # git-cl -- a git-command for integrating reviews on Rietveld
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
-base_dir="${0%\\*}"
+base_dir=$(dirname "$0")
 
 # Uncomment this line if you never use gclient.
 # "$base_dir"/update_depot_tools