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This reverts commit f70764f0.

Reason for revert: https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/133606 Android build failed.

Original change's description:
> Adds a class that encapsulates a range in Blink's accessibility tree.
> 
> This is just a basic class that can convert from a DOM selection to an AX range and vice versa. It can also perform a selection on the AX range.
> This class doesn't still handle any of the many corner cases that I will be looking at next, cases that will be covered by tests.
> R=​dmazzoni@chromium.org
> 
> Bug: 
> Change-Id: I7c98617e8ef3b8bcca8cfc0d2e5518f2da771063
> Reviewed-on: https://chromium-review.googlesource.com/678016
> Commit-Queue: Nektarios Paisios <nektar@chromium.org>
> Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Nektarios Paisios <nektar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542619}

TBR=dmazzoni@chromium.org,yosin@chromium.org,haraken@chromium.org,mlamouri@chromium.org,yoichio@chromium.org,nektar@chromium.org,xiaochengh@chromium.org,xiaochengh@google.com

Change-Id: I9aa2b6ecde4df092f73255e22155087a1f87486b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/959429Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542626}