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This reverts commit 842373f4.

Reason for revert: causing a crash for nearby share: https://crbug.com/1146293

Original change's description:
> [Sharesheet] Animate sharesheet open and close.
>
> This CL adds animation to Sharesheet appear and disappear.
> Appear has a opacity fade in from 0 - 100 in 100ms with linear curve
> and scale fade in 80-100% in 150ms with curve (0.4,0,0.2,1).
> Disappear is a 100-0 in 80ms linear opacity fade out.
>
> In this CL we also disable sharesheet close on deactivate
> when ShareActions have been selected.
>
> Bug: 1148692
> Change-Id: Id6a360438271ad62f5911ed97984c3230a448332
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537502
> Commit-Queue: Maggie Cai <mxcai@chromium.org>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828107}

TBR=pkasting@chromium.org,mxcai@chromium.org,melzhang@chromium.org

Change-Id: I4078300f21b2b9ab7f09563bf1bdcd3b17407f97
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1148692
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545893Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#828505}