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This reverts commit afd24343.

Reason for revert: Caused a memory regression on Mac, for some reason: https://bugs.chromium.org/p/chromium/issues/detail?id=771766

Original change's description:
> Avoid checking overlay ResourcePool in non CA Layer
> 
> Overlay ResourcePool is only used for CA layer.
> BUG=None
> 
> Change-Id: Id37572e65d1b7a2c3307fa80be9820a94d693f7a
> Reviewed-on: https://chromium-review.googlesource.com/685947
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Commit-Queue: Xing Xu <xing.xu@intel.com>
> Cr-Commit-Position: refs/heads/master@{#505913}

TBR=xing.xu@intel.com,piman@chromium.org,danakj@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: None
Change-Id: I0543fa78a715438d9d27c9eb38f643008745679f
Reviewed-on: https://chromium-review.googlesource.com/703714Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506907}