Move data/ directory from WebKit/chromium/tests into web/tests/

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

Review URL: https://codereview.chromium.org/19906002

git-svn-id: svn://svn.chromium.org/blink/trunk@154618 bbb929c8-8fbe-4397-9dbb-9b2b20218538