Remove FIXME regarding respecting overflow clip.
Remove FIXME regarding respecting overflow clip.

Background: https://bugs.webkit.org/show_bug.cgi?id=91117

This is where ShouldRespectOverflowClip was introduced, and, as the name might
suggest, it was only meant to be used for "overflow clip"
(RenderObject::hasOverflowClip()), not "clip" (RenderObject::hasClip()).

The 'clip' property should always be respected, while we have to ignore
overflow clipping sometimes, so that we can composite content not currently
within the viewport established by a scrollable container.

R=chrishtr@chromium.org

Review URL: https://codereview.chromium.org/798913002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187047 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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