Bug 820135 - Preferences: We don't save prefs when we reboot. r=cjones

dom/power/PowerManagerService.cpp

@@ -141,6 +141,7 @@ PowerManagerService::Restart()
   StartForceQuitWatchdog(eHalShutdownMode_Restart, mWatchdogTimeoutSecs);
   // To synchronize any unsaved user data before restarting.
   SyncProfile();
+  sync();
   _exit(0);
   MOZ_NOT_REACHED();
   return NS_OK;

hal/linux/LinuxPower.cpp

@@ -14,12 +14,14 @@ namespace hal_impl {
 void
 Reboot()
 {
+  sync();
   reboot(RB_AUTOBOOT);
 }
 
 void
 PowerOff()
 {
+  sync();
   reboot(RB_POWER_OFF);
 }