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Previously, if the decision was false and we had fetched already or
couldn't fetch, we would wait until DidFinishNavigation to invoke any
registered callbacks.

Change-Id: I0536ff5307d89265863c91845dc3a500a2ecd631
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128526
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754713}