Bug 994915 - Part 1: Move about:newtab CSS into /shared/, r=gijs

--HG--
rename : browser/themes/osx/newtab/controls@2x.png => browser/themes/shared/newtab/controls@2x.png
Bug 1025880 - Avoid highlighting the default selection when the page is reloaded or when the inspector is opened; r=miker
Merge mozilla-central to fx-team
Bug 964861 - Don't update the toolbar state before it gets attached (r=bnicholson)
Bug 1026347 - Session:Prefetch should watch for empty nsIURI.host r=bnicholson
Bug 999211 - Implement cancel editing mode button test on tablet. r=mcomella
Bug 1024574 - Make xpcshell tests show RDP logs. r=past
Bug 1026256 - Add additional telemetry values for pdf.js. r=yury
Backed out changeset 4ff51fc48fa3 (bug 1026347) for causing all android tests to fail; CLOSED TREE
Bug 1026347 - Session:Prefetch should watch for empty nsIURI.host r=bnicholson