Bug 895009.  Don't pass in NonNull/OwningNonNull arguments to WebIDL binding consumers.  r=peterv
Bug 895974.  Implement ParentNode on document fragments and documents and move previousElementSibling and nextElementSibling to ChildNode.  r=smaug
Bug 874843 - Cleanup plugin_focus_helper test events to try and fix intermittent orange. r=roc
Bug 893298 - Correctly calculate button and button child's desired height to vertically center the child. r=bz
Bug 896302 - Add a mochitest for creation of a media recorder object. r=roc