Fail without error when getChildAXNode CDP call errors
Fail without error when getChildAXNode CDP call errors

This happens reguarly if the accessibility tree changes while
we request child nodes. Since we we also receive the change updates
the tree representation in DevTools eventually catches up.

Bug: none
Change-Id: I1c0f98343278b23fd21d0e13ff42e5560d014829
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3553115
Reviewed-by: Changhao Han <68542faf32f0a558a873c0f094ca9bedb2744bff@chromium.org>
Commit-Queue: Johan Bay <c4a91c97e1f8a218202ca733f9e9f5122f475e0f@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend