Bug 858231: Update NSS to NSS 3.15 Beta 3, with local patches
bug-835919.patch and bug-835919.patch. r=wtc.
Bug 866525: Add AddressSanitizer annotations to port_ArenaZeroAfterMark.
r=choller.

Also include fixes for bug 866363, bug 866949, bug 835919, bug 863871.