Remove temporary ui_resources indirection.

The Chrome-side patch moving this directory was landed so Blink can now refer directly to the new location.

Review URL: https://codereview.chromium.org/388893004

git-svn-id: svn://svn.chromium.org/blink/trunk@177982 bbb929c8-8fbe-4397-9dbb-9b2b20218538