Backed out changeset f6422f380251 (bug 1064620) for bustage.
Backed out changesets 59c761f6c0eb and 132f861349a2 (bug 1075531) for robocop bustage.
Bug 1019762 - Wallpaper over "TypeError: this.docShell is null" Promise rejections. r=felipc
CLOSED TREE