Remove unnecessary reference in ActivityManagerService.

Remove referencing mHander in itself. Make message codes simpler.

Change-Id: I996f2805e99297bbc11d8c156560a01017e1ac3c
[Browser]Full screen progress bar displays on the windows screen during playing vp8 clips or http live streaming clips with html5.

When quit to window screen from full screen, hide the controller bar.

Change-Id: Ifac3c8f6bc0e9632364ecac85d55b706e9204778
Author: Yuhan Xu <yuhanx.xu@intel.com>
Signed-off-by: Yuhan Xu <yuhanx.xu@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 40809