Revert of IntersectionObserver: use an idle callback to send notifications.

third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html

Index: third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html b/third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html
index b4fbd3bf681d06d92e3f7292dd0bc1c24dcd3777..637a955f3c97d1c963356a5e20b30d590884e7db 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/observer-without-js-reference.html
@@ -6,26 +6,19 @@
 <div style="width:100%; height:700px;"></div>
 
 <script>
-jsTestIsAsync = true;
-description("IntersectionObserver continues to produce notifications when it has no javascript references.");
-var target = document.getElementById("target");
-var entries = [];
-new IntersectionObserver(function(changes) {
-    entries.push(...changes);
-}).observe(target);
-gc();
-document.scrollingElement.scrollTop = 300;
-// See README for explanation of double RAF.
-requestAnimationFrame(() => { requestAnimationFrame(() => {
-  // In other IntersectionObserver tests, observer.takeRecords() is used to ensure that
-  // all pending notifications are taken.  Because this test specifically tests the
-  // case where the observer object has no js references, it can't use takeRecords().
-  // However, the IntersectionObserver spec mandates that all notifications must be
-  // sent within 100ms of being generated, so this timeout effectively tests conformance
-  // with that requirement.
-  setTimeout(() => {
-    shouldBeEqualToNumber("entries.length", 1);
-    finishJSTest();
-  }, 100)
-}) });
+  jsTestIsAsync = true;
+  description("IntersectionObserver continues to produce notifications when it has no javascript references.");
+  var target = document.getElementById("target");
+  var entries = [];
+  new IntersectionObserver(function(changes) {
+      entries.push(...changes);
+  }).observe(target);
+  gc();
+  document.scrollingElement.scrollTop = 300;
+  requestAnimationFrame(function () {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      finishJSTest();
+    });
+  });
 </script>