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This interface has a single user and is overridden by a single subclass
(SVGImage), so it seems more pertinent to just implement this using
other existing building blocks.

Change-Id: I241c382c71052821e59280cd4cee10d2deef33dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372285
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801702}