IntersectionObserver: remove gc-timing-revealing execeptions.

third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html

Index: third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html b/third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html
index a266655239ff77d0c76910f2633f965edd49d8c6..e41569c531b0ee0c02ff8dc3ede9abad1291e2cc 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/observer-exceptions.html
@@ -80,40 +80,8 @@
 
   observer = initializeObserverThenRemoveRootDiv();
   gc();
-
-  try {
-    observer.observe(target);
-    testFailed("IntersectionObserver.observe() with a deleted root did not throw.");
-  } catch(e) {
-    exc = e;
-    shouldBeType("exc", "DOMException");
-    shouldBe("exc.code", "DOMException.INVALID_STATE_ERR");
-  }
-
-  try {
-    observer.unobserve(target);
-    testFailed("IntersectionObserver.unobserve() with a deleted root did not throw.");
-  } catch(e) {
-    exc = e;
-    shouldBeType("exc", "DOMException");
-    shouldBe("exc.code", "DOMException.INVALID_STATE_ERR");
-  }
-
-  try {
-    observer.disconnect();
-    testFailed("IntersectionObserver.disconnect() with a deleted root did not throw.");
-  } catch(e) {
-    exc = e;
-    shouldBeType("exc", "DOMException");
-    shouldBe("exc.code", "DOMException.INVALID_STATE_ERR");
-  }
-
-  try {
-    observer.takeRecords();
-    testFailed("IntersectionObserver.takeRecords() with a deleted root did not throw.");
-  } catch(e) {
-    exc = e;
-    shouldBeType("exc", "DOMException");
-    shouldBe("exc.code", "DOMException.INVALID_STATE_ERR");
-  }
+  observer.observe(target);
+  observer.unobserve(target);
+  observer.disconnect();
+  shouldBeEqualToNumber("0", observer.takeRecords().length);
 </script>