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I am cleaning up the Convert methods and moving them out of FrameViewBase
in preparation for removing Scrollbar from inheriting from FrameViewBase.
With this change, Scrollbar no longer has any calls to FrameViewBase methods.

There were Convert methods in scrollbar classes that are never called.
* Scrollbar
 - ConvertFromContainingFrameViewBase(IntRect)
 - ConvertToContainingFrameViewBase(IntPoint)
* ScrollableArea and PaintLayerScrollableArea
 - ConvertFromContainingFrameViewBaseToScrollbar(IntPoint)

BUG=637460
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2832883003
Cr-Commit-Position: refs/heads/master@{#466440}