views: Remove early out if not visible in View::OnPaintLayer.
views: Remove early out if not visible in View::OnPaintLayer.

The next thing this function does is call Paint() which has the same
early out.

Review URL: https://codereview.chromium.org/1197323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#335751}

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