Run removed-from-flat-tree test with a11y and parser yield/delay

Bug: none
Change-Id: I1bb6b97eef8e7250bb997c0a1d1b285ea3484d6c
diff --git a/accessibility/crashtests/removed-from-flat-tree.html b/accessibility/crashtests/removed-from-flat-tree.html
new file mode 100644
index 0000000..2deaf6a
--- /dev/null
+++ b/accessibility/crashtests/removed-from-flat-tree.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<audio src="foo"></audio>
+<template shadowroot="closed"></template>