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Since Settings might embed 3rd party ViewControllers, the only interface we could
expect from them in order to clean up or rubberband when swiping down to dismiss
are the AdaptivePresentationControllerDelegate instance methods. For this reason
SettingsRootTableVC now conforms to AdaptivePresentationControllerDelegate, and
any subclass can override or implement any of the these methods.

This CL also forwards all AdaptivePresentationControllerDelegate method calls into
the currently presented Settings VC.

Bug: 1006304
Change-Id: I0ff47d755e5c3e67029e210dfb94d21d700520cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832104Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702016}