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This reverts commit b805090b.

Reason for revert: This makes the mouse get stuck hidden on device.

Original change's description:
> chromeos: makes resizes smoother with mash
> 
> This contains two changes:
> 1. Adds call from ClientRoot to Compositor::OnChildResizing(). This ensures
>    that WindowTreeHost doesn't dispatch move events until the frame has been
>    activated.
> 2. Converts resetting of pointer moves lock from OnCompositingDidCommit()
>    to OnCompositingEnded(). OnCompositingDidCommit() seems to be called much
>    to earlier in the mash case, and results in jank when resizing.
> 
> BUG=929914
> TEST=none
> 
> Change-Id: I68d87d6e7f237f246c2fad6218d9da5356c98641
> Reviewed-on: https://chromium-review.googlesource.com/c/1467917
> Commit-Queue: Scott Violet <sky@chromium.org>
> Reviewed-by: Saman Sami <samans@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#631743}

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

Change-Id: Iaf103ed66885da652c7013fcc412b0269e10b303
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 929914
Reviewed-on: https://chromium-review.googlesource.com/c/1470935Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631803}