favicons: converts from delegate to return values
FaviconBackend was using a mix of delegate and return values to convey results. This was mildly confusing. This patch converts to a return value. The one remaining delegate function is for redirects, which makes sense as a delegate function. BUG=1076463 TEST=covered by tests Change-Id: I9bc84e9afcb02a417b62180cae5fe5a89a09ef28 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357851 Commit-Queue: Scott Violet <sky@chromium.org> Reviewed-by:Peter Kotwicz <pkotwicz@chromium.org> Cr-Commit-Position: refs/heads/master@{#798668}
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