some of the files have attribute changes, the server responds with a
list of files where the files with attribute changes have backslashes
(as they do in the svn diff output).  Fix this in the client.

A server-side fix might also be nice; where does the server-side code live?

BUG=none
TEST=none

Patch contributed by Joi.

Review URL: http://codereview.chromium.org/112050

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@16688 0039d316-1c4b-4281-b951-d872f2087c98