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With the introduction of SimpleDownloadManagerCoordinator, it has 2
stages. In the first stage, OnDownloadsInitialized() will be called
for in-progress downloads. In this stage, clients should be able to
access all the in-progress downloads. In the 2nd stage,
OnDownloadsInitialized() is called for all downloads.

However, if InProgressDownloadManager is passed to a
DownloadManagerImpl, the DownloadManagerImpl will not return the
in-progress downloads on GetAllDownloads() unless it is fully initialized.
As a result, this causes a wierd issue that after stage 1, calling
GetAllDownloads() sometimes may not return all the downloads until
stage 2 completes.

BUG=942770

Change-Id: I44e589ee1bd174c5fef86ec9c8170ac94e6e1b5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603208Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658795}