Revert "Temporarily remove content-permissions test add-on till Bug 1094068 is fixed. a=@gozala"

This reverts commit 07c466d8dc061c511627c517ed95b555a4c0cf73.
Bug 1089236: Disabel failing tests.
bug 1090135 - use nsIDOMWindowUtils::loadSheetUsingURIString
Merge pull request #1693 from zombie/1090135-loadSheet

bug 1090135 - use nsIDOMWindowUtils::loadSheetFromURIString(), r=@Mossop
Bug 1094392: Don't claim page-mods are weak referential when we already hold a strong reference to them.
Merge pull request #1701 from Mossop/bug1094392_2

Bug 1094392: Don't claim page-mods are weak referential when we already hold a strong reference to them. r=zombie
Bug 1083068 - Improve SDK logging when a promise is rejected during tests. r=gozala
Bug 1060138: Fix context-menu to work in e10s.
Update for the changes to the platform.