Fix ascii art escaping.
Fix ascii art escaping.

This was done because a line ending with a '\' will not be printed properly.
Completely escape the string.

R=stip@chromium.org
BUG=

Review URL: https://codereview.chromium.org/557143002

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@291906 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools