Turns out svn treats extra whitespace as part of the revision number and throws an exception.

BUG=44790
TEST=insert some spaces in your revision arguments, gclient should still work
Review URL: http://codereview.chromium.org/2077017

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@47979 0039d316-1c4b-4281-b951-d872f2087c98