Revert "DownloadProvider: Add transfer speeds in notification"

This reverts commit 72502782df2ed0055194f6e41af770817206c386.
DownloadProvider: Transfer speeds in notification

Change-Id: If76ca4c8793f81169c57ca75e97aff70e96b2eac
DownloadProvider: Normal notification for singles

This builds upon the previous DownloadNotifier, but changes
the notification style when downloading single files by
removing the big view.

Change-Id: I06d2b555bb51613661ccb50df3b7bc59439b2252
DownloadProvider: Standardize notifications

Standardize play store and browser download notifications
Image: http://i.imgur.com/w3VaRUK.png

Change-Id: Ibadcca3725b4adb330a5670414ac8f89790448b8
[2/2] DownloadProvider: DownloadManager: add support pause/resume/stop notifications

Change-Id: Ic017be60e9bf9ed23e5f262c63870ad50102364c