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This reverts commit c7496eca.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Revert "All callbacks to notify when InProgressDownloadManager is initialized"
> 
> This reverts commit 39c14237.
> 
> Reason for revert:
> Broke many tests on many bots, eg. https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Tests%20x64%20%28dbg%29/1473
> 
> Original change's description:
> > All callbacks to notify when InProgressDownloadManager is initialized
> > 
> > Currently DownloadManagerImpl intializes InProgressDownloadManager.
> > However, when only ServiceManager is running, DownloadManagerImpl will
> > not be created.
> > As a result, some other class will initialize InProgressDownloadManager.
> > And when chrome fully starts, DownloadManagerImpl needs to know whether
> > InProgressManager has been initialized.
> > This CL allows InProgressDownloadManager to take more callbacks to
> > notify when initialized.
> > So multiple classes can observe the initialization event.
> > 
> > BUG=842245
> > 
> > Change-Id: I5881b10db0f93f98262ab1baebc67621c2743fbe
> > Reviewed-on: https://chromium-review.googlesource.com/1111027
> > Commit-Queue: Min Qin <qinmin@chromium.org>
> > Reviewed-by: David Trainor <dtrainor@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#569849}
> 
> TBR=dtrainor@chromium.org,qinmin@chromium.org
> 
> Change-Id: Ic2e8b09dc8aca3680c7a5939fdfb545e0dfec82a
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 842245
> Reviewed-on: https://chromium-review.googlesource.com/1112977
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569879}

TBR=thakis@chromium.org,dtrainor@chromium.org,qinmin@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 842245
Change-Id: I9a2d1e2215f755785190400e554408f3bf2e7de5
Reviewed-on: https://chromium-review.googlesource.com/1113839
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570140}