Start moving unit test files from WebKit/chromium to web/.

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

Review URL: https://chromiumcodereview.appspot.com/19139002

git-svn-id: svn://svn.chromium.org/blink/trunk@154200 bbb929c8-8fbe-4397-9dbb-9b2b20218538