Bug 931428 - Include NullPtr.h in GStreamerLoader.cpp; r=ehsan
Bug 784739 - Switch from NULL to nullptr in dom/ (1/2); r=ehsan
Bug 784739 - Switch from NULL to nullptr in dom/ (2/2); r=ehsan
Bug 784739 - Switch from NULL to nullptr in security/; r=ehsan
Bug 784739 - Switch from NULL to nullptr in widget/; r=ehsan
Bug 784739 - Switch from NULL to nullptr in js/; r=ehsan