Bug 1091533, Part 1: Don't wrap tgkill() on the Nuwa process. r=BenWa
Bug 1091533, Part 2: Implement NuwaAddThreadConstructor() to allow a thread to perform a custom action after being recreated in the content process. r=khuey,tlee
Bug 1091533, Part 3: Reset thread id in SPS when a content process is forked. r=BenWa