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* Make tryToSetTopLevelFrame() and tryToClearTopLevelFrame() to return
void instead. Nobody was using the returned value anyway.
* Remove topLoadingFrame(). I was not used externally.

No behavior changes here.

Bug: 936696
Change-Id: I21c4266140dba897a89f4ae558c2a30dbb44615b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1492339
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638607}