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This CL replaces fetching the badge icon with fetching splash icon in
WebApk update.

With This CL, webapk will request update if the splash icon is changed.

Bug: 1043271
Change-Id: Ia297e7cc20fdacd652262fdb9101717526e1a341
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037819
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744868}