backout 4149244358fd and 5ad0e08799d9 (bug 851520) for b2g bustage on a CLOSED TREE
Bug 857599 - Clone profile for Marionette tests to prevent polluting the original profile. r=jgriffin
Bug 851701 - Remove 'Load images automatically' checkbox from prefs, r=gavin
Bug 856425: Call onicecandidate with a null candidate immediately after setLocalDescription succeeds r=ekr
bug 851520 - add systemDefaultScale attribute to nsIScreenManager, and use it to decide when to remove browser.content.full-zoom prefs during UI migration if running on windows/hi-dpi. r=roc,adw
Bug 851253 - SimplePush: Only wakeup apps that have registrations. r=jlebar

--HG--
extra : rebase_source : bbca711265f60ee06124d82d82077c3e02aca02a
bug 857906 progress indicator spinning on multipart motion jpeg r=duell sr=bz

--HG--
extra : rebase_source : 6b3beea6f6bb91e21c37e6dd01e5c6445317f994
Bug 851702 - Remove JS load and advanced preferences from the UI, r=gavin
Backout changeset 5abbf6fd5466 (Bug 830100) for sctp_unittest failure ON A CLOSED TREE r=ryanvm
Bug 851701, bug 851702 - reset image/js loading preferences, r=gavin

--HG--
extra : rebase_source : 8c15749c35d9bf503497835c9b2d7b9c138c4879