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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 to the Reset to satisfy
all other cases where the Hung Pages Modal gets fired in:

 - RenderProcessExited
 - RenderWidgetHostDestroyed
 - TabDestroyed,
 - RenderViewHostChanged
 - WebContentsDestroyed

Bug: 1140454
Change-Id: I4e5b375acb351f5338faff3f30b65b38fc834818
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545050Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mohamed Mansour <mmansour@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#829021}