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This patch replaces the use of apng animation file (580 KiB) with a
lottie animation file (8 KiB).

Bug: 976057
TEST: Manually navigated to the animation page
Change-Id: I4c8fa8784b1e2bd1be071752eae8696f58c66737
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725235
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688683}