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These images currently reside in shared WebUI code under
ui/webui/resources/images/, but they are only used by the Feedback app.

Also removing flattenhtml="true" from feedback/html/default.html since
it is not actually needed.

Bug: 1132403
Change-Id: I76fc062a7e57742faf5ee6068a9fc052e46fd2d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528208Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825944}