Elliott Sprehn b8843caa44 Remove concept of child Widgets.
FrameView doesn't really need to know about the child widgets,
which are just Scrollbars now.

I also deleted some dead code from Widget and removed FrameWidget
since we don't need that abstraction now.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/685593005
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