Otherwise if there is a file named breakpad.py for instance in the current
directory, it will be loaded instead of the one in depot_tools.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6312034

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@73165 0039d316-1c4b-4281-b951-d872f2087c98