Revert "Download: add to support pause/resume download by manual"

This reverts commit 56f9cde8c6df4de83505413233812db896379d10.
[1/2] Base: DownloadManager: add support pause/resume/stop notifications

Add pause, resume and stop functions to make user can pause, resume and stop downloads by manual in downloads application.

Change-Id: I82ffff5a539448faab8933e2b47591199bf24cb9