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For incognito profiles, we don't load history db. So we should not wait
for history to be loaded and send the OnManagerInitialized callback as
soon as the in-progress cache is ready. Without this initialization
notification, the observers will fail to function correctly.

TBR=qinmin@chromium.org

Bug: 987535
Change-Id: Idf960e2b60dbec302b8be847ba0b784dfa884cf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718776
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681081}