Revert "Prevent nullptr crash with CC side-scrollbars"

This reverts commit 308ed6798c0291e460fa1f9146058ab31891ea26.

Reason for revert: Did not prevent the crash

Original change's description:
> Prevent nullptr crash with CC side-scrollbars
> 
> I'm not yet sure why this crash is happening but in the mean time it
> should be safe to avoid returning a nullptr which client code can crash
> on.
> 
> Bug: 924068
> Change-Id: I3409acc61cf8498962de9a13f541a71842d61ef4
> Reviewed-on: https://chromium-review.googlesource.com/c/1469290
> Reviewed-by: Robert Flack <flackr@chromium.org>
> Commit-Queue: David Bokan <bokan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#631700}

TBR=flackr@chromium.org,bokan@chromium.org

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

Bug: 924068
Change-Id: Ia5bfa2b2200872cdb2bca6aa60d313dab353844c
Reviewed-on: https://chromium-review.googlesource.com/c/1478408
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633581}
1 file changed