Move animation timing tests to subdirectory

third_party/WebKit/LayoutTests/animations/timing/delay-timer-cancel-bug.html

-<script src="../resources/testharness.js"></script>
-<script src="../resources/testharnessreport.js"></script>
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
 <div id="target"></div>
 <script>
 var asyncHandle = async_test('Delayed animations are unaffected by on demand timeline updates.');
 target.animate(null, {delay: 100}).onfinish = () => asyncHandle.done();
 requestAnimationFrame(() => {
   requestAnimationFrame(() => {
     setTimeout(() => {
       // Force layout tree update which forces an on demand timing update.
       target.offsetTop;
     }, 0);
   });
 });
 </script>