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This reverts commit 68d8dbc0.

Reason for revert: Looks like it makes PrerenderBrowserTest.PrerenderInfiniteLoop according to FindIt. 

../../chrome/browser/prerender/prerender_browsertest.cc:1721: Failure
Expected equality of these values:
  1U
    Which is: 1
  GetLinkPrerenderCount()
    Which is: 2

Original change's description:
> Don't make a LayerTreeFrameSink for a non-visible RenderWidget.
> 
> Importantly, non-visible RenderWidgets include swapped out RenderWidgets
> which are zombies, without a frame, and which should not be used.
> 
> This can happen if the RenderWidget swap out races with the posted task
> from the compositor to make a LayerTreeFrameSink. When swapping out, the
> compositor would be marked as not-visible, which would stop it from
> making such requests, but one could already be in flight.
> 
> In the other case, honoring the request for a non-visible compositor is
> more benign, but we can delay it until the compositor is actually
> visible again. This means if a context is lost, backgrounded tabs would
> not all attempt to reconnect to the Gpu process at once.
> 
> This is a better followup for the hacky
> https://chromium-review.googlesource.com/c/chromium/src/+/1292711 which
> was meant only for merge to a release branch. It reverts that change as
> part of this one.
> 
> R=​piman@chromium.org
> 
> Change-Id: I058bdc37482d04bb86d65a7377b7520dad8573e7
> Bug: 896836, 419087
> Reviewed-on: https://chromium-review.googlesource.com/c/1292714
> Commit-Queue: danakj <danakj@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#606655}

TBR=danakj@chromium.org,dcheng@chromium.org,piman@chromium.org

Change-Id: I65238aba0abdb6c9192e9f3cb3691f8dd89b3ea5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 896836, 419087, 903696
Reviewed-on: https://chromium-review.googlesource.com/c/1329003Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606807}