Improve DEFINE_STATIC_LOCAL()'s handling of Blink GCed objects.

third_party/WebKit/Source/modules/device_orientation/DeviceMotionDispatcher.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #include "modules/device_orientation/DeviceMotionDispatcher.h"
 
 #include "modules/device_orientation/DeviceMotionController.h"
 #include "modules/device_orientation/DeviceMotionData.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 DeviceMotionDispatcher& DeviceMotionDispatcher::instance()
 {
-    DEFINE_STATIC_LOCAL(Persistent<DeviceMotionDispatcher>, deviceMotionDispatcher, (new DeviceMotionDispatcher()));
-    return *deviceMotionDispatcher;
+    DEFINE_STATIC_LOCAL(DeviceMotionDispatcher, deviceMotionDispatcher, (new DeviceMotionDispatcher));
+    return deviceMotionDispatcher;
 }
 
 DeviceMotionDispatcher::DeviceMotionDispatcher()
 {
 }
 
 DeviceMotionDispatcher::~DeviceMotionDispatcher()
 {
 }
 
@@ skipping 19 matching lines @@
     m_lastDeviceMotionData = DeviceMotionData::create(motion);
     notifyControllers();
 }
 
 DeviceMotionData* DeviceMotionDispatcher::latestDeviceMotionData()
 {
     return m_lastDeviceMotionData.get();
 }
 
 } // namespace blink