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

This reverts commit 4ea82b5f97c3bb1a75c174a511a06196994792f5.
[1/2] Add to support pause/resume download

We add pause and resume API here so that application can
pause and resume downloads manually by DownloadManager.
This contains two points:
1. add pause and resume download APIs.
2. add another paused reason for this download status.

PS2/3:
* Fix code.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I606b48ca20f43bcc6c119683818c2ab6ff03bfe5
Long press recents to switch to last app

Change-Id: I8c52a7b40d4229d523bccc1c9246673b82f5b48b
Conflicts:
	packages/SystemUI/res/values/pa_strings.xml
Immersive: Update global tile drawables

Bigger arrows, thanks to Lo Huot for the drawables.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Conflicts:
	packages/SystemUI/res/drawable-hdpi/ic_qs_immersive_global_on.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_immersive_global_on.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_immersive_global_on.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_immersive_global_on.png