Monitor sleep/wake on Mac. Should fix some networking issues arising after sl...

app/system_monitor.cc

Index: app/system_monitor.cc
===================================================================
--- app/system_monitor.cc	(revision 67272)
+++ app/system_monitor.cc	(working copy)
@@ -29,9 +29,15 @@
       base::TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), this,
       &SystemMonitor::BatteryCheck);
 #endif  // defined(ENABLE_BATTERY_MONITORING)
+#if defined(OS_MACOSX)
+  PlatformInit();
+#endif
 }
 
 SystemMonitor::~SystemMonitor() {
+#if defined(OS_MACOSX)
+  PlatformDestroy();
+#endif
   DCHECK_EQ(this, g_system_monitor);
   g_system_monitor = NULL;
 }