AXObjectCacheImpl::postNotification shouldn't post on an ancestor.

AXObjectCacheImpl::postNotification shouldn't post on an ancestor.

This is a code simplification. AXObjectCacheImpl::postNotification
doesn't need to post on an ancestor element if the AXObject for the
element it's trying to post on doesn't exist. The notification might
not make sense on that ancestor element, anyway.

If we find something specific that this breaks, we should replace it
with an explicit fix instead, rather than relying on this too-broad
solution.

BUG=none

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192685

[dmazzoni, 2015-03-25 22:03:06]

dmazzoni@chromium.org changed reviewers:
+ aboxhall@chromium.org, je_julie.kim@samsung.com

[je_julie(Not used), 2015-03-27 09:04:14]

I agree with you.
lgtm

[dmazzoni, 2015-03-27 13:36:54]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2015-03-27 13:37:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1032183003/20001

[commit-bot: I haz the power, 2015-03-27 16:16:46]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192685