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This reverts commit 346efa24.

Reason for revert: This broke compositing/video/video-poster.html on  WebKit Mac10.13. Maybe we just need to rebaseline?

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/WebKit%20Mac10.13%20%28retina%29/6654

The trees are burning now, so allow me to be conservative and revert it just in case.

Original change's description:
> [Regression] Don't squash into content underneath a video tag.
> 
> This works around a hard to fix bug in pre-BGPT Blink compositing
> code that involves mismatches between clips in the property trees
> and clips in the graphics layers.
> 
> After BGPT launches, this patch can be reverted, and videos
> changed to report ShouldClipOverflow() as true on their LayoutBox.
> 
> Bug: 900602
> 
> Change-Id: I76f5d18f2ecd9a10120d96c4a7898b641b5f557a
> Reviewed-on: https://chromium-review.googlesource.com/c/1337289
> Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#608505}

TBR=pdr@chromium.org,chrishtr@chromium.org

Change-Id: I0be4eb8f16d9bc5e0f05c02c57f63646ff048ba6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 900602
Reviewed-on: https://chromium-review.googlesource.com/c/1338587Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608655}