Expect Accessibility.getChildAXNodes errors

Example failure: https://ci.chromium.org/ui/p/devtools-frontend/builders/ci/Stand-alone%20Mac/18025/overview

Bug: none
Change-Id: Ia1d798c0ab04cdf7fd4b3fe51b6301a7c6799375
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6477426
Auto-Submit: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>

test/conductor/events.ts

diff --git a/test/conductor/events.ts b/test/conductor/events.ts
index 697c350..dd14bbb 100644
--- a/test/conductor/events.ts
+++ b/test/conductor/events.ts
@@ -32,6 +32,8 @@
   'Request Runtime.evaluate failed. {"code":-32602,"message":"uniqueContextId not found"}',
   'uniqueContextId not found',
   'Request Storage.getStorageKeyForFrame failed. {"code":-32602,"message":"Frame tree node for given frame not found"}',
+  // Some left-over a11y calls show up in the logs.
+  'Request Accessibility.getChildAXNodes failed. {"code":-32602,"message":"Invalid ID"}',
   'Unable to create texture',
   'Not allowed to load local resource: devtools://theme/colors.css',
   // neterror.js started serving sourcemaps and we're requesting it unnecessarily.