One accessibility tree per frame.

third_party/WebKit/LayoutTests/accessibility/event-on-deleted-iframe-causes-crash.html

Index: third_party/WebKit/LayoutTests/accessibility/event-on-deleted-iframe-causes-crash.html
diff --git a/third_party/WebKit/LayoutTests/accessibility/event-on-deleted-iframe-causes-crash.html b/third_party/WebKit/LayoutTests/accessibility/event-on-deleted-iframe-causes-crash.html
deleted file mode 100644
index e70a968e164b29a0a64c5b25b78b75ca55b78466..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/accessibility/event-on-deleted-iframe-causes-crash.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<div contenteditable="true">
-   <span id="item1">Lorem
-   <br/>
-   more Lorem!
-   <blockquote>
-      ipsum
-   <span id="item2">
-</div>
-
-<script>
-    if (window.testRunner)
-        testRunner.dumpAsText();
-
-    var s = window.getSelection();
-    var p1 = document.getElementById("item1");
-    var p2 = document.getElementById("item2");
-    s.setBaseAndExtent(p1, 0, p2);
-    document.execCommand("Indent");
-
-    // This code doesn't do anything initially, but the code below creates an iframe
-    // with the same url as this one, and that time it will delete itself.
-    var frame = window.parent.document.querySelector('iframe');
-    if (frame)
-        frame.remove();
-</script>
-<script>
-    // This creates an iframe with the same url as this one, which triggers
-    // the code above that deletes this iframe, and then triggers a possible crash
-    // when the execCommand fires accessibility notifications that trigger creation
-    // of the AXScrollArea corresponding to the frame that's in the process of
-    // being deleted.
-    var iframe = document.createElement('iframe');
-    iframe.src = window.location;
-    document.body.appendChild(iframe);
-</script>