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This reverts commit 0156c949.

Reason for revert: series of review fixes resulted in a no-op code. The completely different approach should be used to fix the bug correctly.

Original change's description:
> Fix 0,0-0x0 turning into PaintOp::kUnsetRect.
>
> When a paint chunk having 0,0-0x0 rect is processed inside an effect, an early
> return prevents the effect_bounds_stack_.back() update in a
> ConversionContext::UpdateEffectBounds call. This results in keeping default
> PaintOp::kUnsetRect in SaveLayerOp::bounds instead of 0,0-0x0 rect.
>
> This is probably a reason for a related bug 918240 (see bug thread Comment 4 for
> details). Application of this patch fixes the lagging print preview.
>
> R=​fmalita@chromium.org, samans@chromium.org
>
> Bug: 918240
> Change-Id: I022ae01418e83184421cff7e22566228a2f7c6d3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1396958
> Commit-Queue: Denis Bessonov <dbessonov@yandex-team.ru>
> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#714293}

Bug: 918240
Change-Id: I89a55d39a53559b37168b91adf3f331dbbf8b106
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007409
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Auto-Submit: Denis Bessonov <dbessonov@yandex-team.ru>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733491}