Bug 917266 - Remove some unneeded code in netwerk/; r=mcmanus
Bug 917304 - Remove some dead code in docshell/; r=bzbarsky
Bug 917302 - Remove some dead code in embedding/; r=bsmedberg
Bug 917267 - Remove some unneeded code in xpconnect; r=bholley
Bug 904687 - Introduce Svox Pico speech synthesis service. r=smaug f=gps

 - moz.build updates.
 - Use nsISupports thread-safe decleration macros.
 - Also with PicoVoice, changed to thread-safe add/remove ref macro. We are now creating them off main thread.
 - Do initialization off main thread, but go back to main thread to register the voices.