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There seems to be a timing issue between the AX queries for
GetText and when the model is updating. Looking at the model
it seems not all TabDestroyed calls are informing the Observers
that the model has changed.

The TableView uses Virtual AX Children that depends on the
observers to call. Moved the observer call from TabDestroyed to Reset
to handle all delegate_->TabDestroyed() calls defined below:

 - RenderProcessExited
 - RenderWidgetHostDestroyed
 - TabDestroyed,
 - RenderViewHostChanged
 - WebContentsDestroyed

Bug: 1140454
Change-Id: Ie7fd07d6540b9509b998d5cd95d1fd16f47f9018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530295Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mohamed Mansour <mmansour@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#827900}