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Before r705637, these images were inlined with Grit's flattenhtml attribute.
After that CL, flattenhtml was removed, but the images were not registered
with the corresponding WebUIDataSource, resulting in a broken URL request
for chrome://sync-confirmation/images/sync_confirmation_illustration.svg

Fixing by individually registering those images with the WebUIDataSource.

Fixes: 1014447
Change-Id: I198b99030f46fccc7dc38ad6d80a7a89da2a9ac3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863350
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706140}