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DownloadManagerService already listens to AllDownloadEventNofitier, so
there is no need to implement OnDownloadInitialized().
The service manager connector can also be provided to
InProgressDownloadManager ctor, so there is no need to implement
GetServiceConnector().

BUG=942770

Change-Id: Ibc143b832c734e3a1fac0af6044aba99f8d7c1b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606182Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658755}