Update the references to ui_resources target.

This target was moved into ui/resources/ui_resources.gyp in Chromium's
revision r236099 (crrev.com/236099).

BUG=299841
TEST=None
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/78873002

git-svn-id: svn://svn.chromium.org/blink/trunk@162387 bbb929c8-8fbe-4397-9dbb-9b2b20218538