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This reverts commit fc8af8e6.

Reason for revert: Crashing on MAC bots https://ci.chromium.org/p/chromium/builders/ci/Mac10.15%20Tests/5816

Original change's description:
> Fix Crash in Hung Pages view while in screen reader
>
> 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/+/2530295
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Mohamed Mansour <mmansour@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#827900}

TBR=sky@chromium.org,tapted@chromium.org,robliao@chromium.org,dfried@chromium.org,mmansour@microsoft.com

Change-Id: Ifb73fc1762d043fbba1d3a3a8b5744c169b9a88b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1140454
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543191Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827977}