Remove import readline since it is not used and not available on win32
Fix the tempfile.NamedTemporaryFile() handling on win32.

Review URL: http://codereview.chromium.org/113480

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@16220 0039d316-1c4b-4281-b951-d872f2087c98