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Currently, the PictureInPictureWindowController is reset and torn down
whenever a new video goes into Picture-in-Picture mode. This is less
than ideal since the PictureInPictureWindowController is attached and
scoped to the lifetime of a WebContents via WebContentsUserData.

Rather, we should allow the natural teardown of the controller when
the initiator tabs is destroyed.

BUG: 823172
Change-Id: I7e13b8bf45899fd4ff4b3dbd34781d04ab15dc1d
Reviewed-on: https://chromium-review.googlesource.com/1034194
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555415}