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This reverts commit 3bdb9041.

Reason for revert: Seems to be causing crashes on Pixel 2: https://ci.chromium.org/ui/p/chrome/builders/ci/android-pixel2-perf/13030/overview

Original change's description:
> Accessibility Image Descriptions Port, Part VII - Incognito
>
> This CL is the seventh part of an effort to port the existing Desktop
> feature to Android. This feature enables a user to send an image to
> Google to process to generate a descriptive alt text if a website
> does not provide one.
>
> Design Doc: go/2020-q1-android-image-descriptions
> Slide Deck: go/clank-imageDescriptions
> Launch Bug: 1057168
>
> Original Desktop Design Doc for reference:
> go/chrome-a11y-annotations-design
>
> This is a conservative approach, we use a separate set of profile
> Prefs for this feature rather than syncing with the Desktop Prefs.
> This can be updated in time as needed.
>
> ----------
>
> This CL adds the following:
>
> - Syncs Regular and Incognito behavior as per new reqs
> - Corrects unit tests for above
> - Adds an AXMode observer to watch for screen readers being enabled
>
> ----------
>
>
> AX-Relnotes: Android accessibility image descriptions behavior in incognito tabs will now match the regular tabs behavior for that profile.
> Bug: 1057169
> Change-Id: I27b6cb1c3da4cae441a6519815f7835049827452
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585587
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Mark Schillaci <mschillaci@google.com>
> Commit-Queue: Mark Schillaci <mschillaci@google.com>
> Cr-Commit-Position: refs/heads/master@{#836174}

TBR=dmazzoni@chromium.org,twellington@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,mschillaci@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1057169
Change-Id: Ib28af4808090c432219137456451aa1b9ce6c230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589933Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836625}