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This reverts commit 1423331f.

Reason for revert: speculative attempt due to unhappy MSan ChromiumOS bot.
See also crbug.com/806638.

Original change's description:
> mus: Fix event processing for touch events in unified mode
> 
> This refines my earlier work done in: http://crrev.com/c/842467
> 
> Move event target nulling and root location use to WindowTreeClient, to ensure events reach MusUnifiedEventTargeter.
> Otherwise, WindowEventDispatcher::GetInitialEventTarget will use the touch gesture recognizer's target (returned by GetPriorityTargetInRootWindow) before performing the mirror display transformation on the event's location.
> 
> Inline DispatchEventToTarget for additional clarity.
> 
> Bug: 805714
> Test: Mus touch events work in Chrome OS's unified desktop mode.
> Change-Id: Ic4844c85cc24a9f9885e7705ff27cb57b305d245
> Reviewed-on: https://chromium-review.googlesource.com/887250
> Commit-Queue: Michael Wasserman <msw@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#532030}

TBR=sky@chromium.org,msw@chromium.org

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

Bug: 805714
Change-Id: I02333546f91d0d0f495153c8556aa9820612673d
Reviewed-on: https://chromium-review.googlesource.com/890841Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532328}