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As far as I can tell this class has never had a user in chromium.

This change also removes the ImageViewBase abstraction layer, which
was added to support AnimatedImageView.

Bug: None
Change-Id: I9af55bfb0ef1b7a07a2d5a1db234b5e998a66c07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842037Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703416}