Bug 1027471 - [LockScreen][System] Split notification.js into LockScreen and System parts
Bug 1027401 - Change child event mechanism
Bug 1009133 - [Music] Add hidden style to the player and done icons
Bug 974878 - [MMS]Create new contact/ add to exist contact with email address r=julien
Merge pull request #21444 from alivedise/bugzilla/1027401_v2.1/reset-orientation-on-popupclose

Bug 1027401 - Change child event mechanism, r=etienne
Merge pull request #21294 from dominickuo/bug-1009133

Bug 1009133 - [Music] Add hidden style to the player and done icons, r=jimporter
Merge pull request #20736 from snowmantw/issue1027471

Bug 1027471 - [LockScreen][System] Split notification.js into LockScreen...
Bug 1009271 - opened window.open dialog link as view activity

- fix activityclose typo in activity window
- No transition when the callee is caller
- add sheets window dialog test case
- always use AWM.activeApp.getTopMostWindow() as caller