Magic patch from bug 933336
Bug 936312: Adjust tests' assumptions about B2G's WebGL support.
Bug 942290: Merge ARM exidx info with DWARF if both are present.
Bug 945498: Use breakpad to report seccomp violations as crashes. r=ted, r=kang

Upstream issue for breakpad patch: https://breakpad.appspot.com/1114003/
Bug 945504: Include JS stack in sandbox reporter logs.
Bug 967967: Record that children of Nuwa start with full privileges.

Otherwise, the fix for bug 921817 assumes that they've already dropped
permissions and enables system call sandboxing too early.