Add a new regression test for custom_deps in .gclient files.
Add a new regression test for custom_deps in .gclient files.

To make sure to regression is added while looking into the code more deeply.

BUG=none
TEST=new smoke test

Review URL: http://codereview.chromium.org/4215001

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@64230 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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