Deflaky pointerevent_touch-action-inherit_child-auto-child-none_touch.html

This test is currently failed on this bot because of memory leak
https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Linux%20Leak

Bug: 606367
Change-Id: Ie7b7ee195cfbfa4afc51bada69f5e2a471f537f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637697Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664878}

third_party/blink/web_tests/external/wpt/pointerevents/pointerevent_touch-action-inherit_child-auto-child-none_touch.html

@@ -117,9 +117,9 @@
 
                 // Inject touch inputs.
                 actions_promise = touchScrollInTarget(scrollTarget, 'down').then(function() {
-                    touchScrollInTarget(scrollTarget, 'right');
+                    return touchScrollInTarget(scrollTarget, 'right');
                 }).then(function() {
-                    clickInTarget("touch", btnComplete);
+                    return clickInTarget("touch", btnComplete);
                 });
             }
         </script>