Reapply r79006 with fixes for ubuntu 10.4.

The only change is in fix_default_encoding() to trap an exception
locale.getlocale() may throw.

R=dpranke@chromium.org
BUG=none
TEST=unit test

Review URL: http://codereview.chromium.org/6721029

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79144 0039d316-1c4b-4281-b951-d872f2087c98