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This is a reland of c669ac6b

This is only the fix and not the test.

Original change's description:
> [Paint Preview] Post task captured callback
>
> This CL attempts to fix a bug where calling
> WebContents::DecrementCapturerCount in the callback passed to
> PaintPreviewClient can result in reloading a crashed render frame.
> This is problematic and crashes if it occurs inside RenderFrameDeleted
> and PaintPreviewClient::OnFinished is invoked. By posting the callback
> it should be invoked after RenderFrameDeleted cleanup is done resulting
> in DecrementCapturerCount no longer being called inside
> RenderFrameDeleted.
>
> Bug: 1146573
> Change-Id: Iccb612d89135e058d8fc06de018e7c95cd91657a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595247
> Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
> Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
> Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#837649}

Bug: 1146573
Change-Id: I19623734e3c16b8646c286f47420a432647e0e24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596727
Auto-Submit: Fergal Daly <fergal@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838141}