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Currently we use DownloadForegroundServiceObservers to broadcast
download foreground service events. It uses reflection to cache the
class name and then persist to android shared preference.

DownloadNotificationServiceObserver implements
DownloadForegroundServiceObservers.Observer, and then call methods of
the singleton object of DownloadNotificationService.

Also, onForegroundServiceRestarted() is not getting called, which make
the following calls dead code.

This is extremely weird, we can just call the one line singleton
method.

Bug: 922929
Change-Id: I28ff5552fd7fc0fd5a111cd4971d6bf4514bb45f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063853Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743368}