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Speculative revert, see build failures on Win10 Tests x64 (dbg):
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Tests%20x64%20%28dbg%29/803

Bug: http://crbug.com/846837

This reverts commit 983e926b.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Re-land: Avoid serializing the same accessibility node twice in the same message
> 
> Originally landed: r560165, crrev.com/c/1063007
> Reverted: r561246, crrev.com/c/1069891
> 
> TBR=dtseng@chromium.org
> Bug: 651614, 845778
> 
> Change-Id: I77b54de28cb0c4a231b5b0758ba4708100d27fff
> Reviewed-on: https://chromium-review.googlesource.com/1072875
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#561913}

TBR=dmazzoni@chromium.org,dtseng@chromium.org

Change-Id: I5cbf8006e4917a9c008143ae4b746543d2b038c2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 651614, 845778, 846837
Reviewed-on: https://chromium-review.googlesource.com/1074050Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562043}