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This reverts commit 499570b6.

Reason for revert: Caused failures in browser_tests debug builds for
two tests:

CrExtensionsItemsTest.ClickableItems
CrExtensionsItemsTest.FailedReloadFiresLoadError

Original change's description:
> MD Extensions - A11y: Announce when an extension has been updated.
> 
> Bug: 27175
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: I2fed4c16cf0406ea5361413840fe5ab2f5968f69
> Reviewed-on: https://chromium-review.googlesource.com/1003056
> Commit-Queue: Hector Carmona <hcarmona@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#551142}

TBR=rdevlin.cronin@chromium.org,hcarmona@chromium.org

Change-Id: I8f6e654c798127a3a77d0cb2a107443aa8465686
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 27175
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/1012850Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551284}