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Currently InProgressDownloadManager is created in DownloadManagerImpl.
However, for content layer, we don't need to create the in-progress DB.
As a result, This CL move InProgressDownloadManager creation to Chrome layer,
it also allows us to construct the SimpleFactoryKey from the profile,
which can later be used to create the SimpleDownloadManagerCoordinator.

BUG=942770

Change-Id: I8f020f2685dd0d6972c56ab1225b440c3c73051b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1555010Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648745}