Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_light/DeviceLightDispatcher.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/device_light/DeviceLightDispatcher.h"
 
 #include "modules/device_light/DeviceLightController.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 DeviceLightDispatcher& DeviceLightDispatcher::instance()
 {
-    DEFINE_STATIC_LOCAL(DeviceLightDispatcher, deviceLightDispatcher, ());
-    return deviceLightDispatcher;
+    DEFINE_STATIC_LOCAL(Persistent<DeviceLightDispatcher>, deviceLightDispatcher, (new DeviceLightDispatcher()));
+    return *deviceLightDispatcher;
 }
 
 DeviceLightDispatcher::DeviceLightDispatcher()
     : m_lastDeviceLightData(-1)
 {
 }
 
 DeviceLightDispatcher::~DeviceLightDispatcher()
 {
 }
 
+void DeviceLightDispatcher::trace(Visitor* visitor)
+{
+    PlatformEventDispatcher::trace(visitor);
+}
+
 void DeviceLightDispatcher::startListening()
 {
     Platform::current()->startListening(WebPlatformEventDeviceLight, this);
 }
 
 void DeviceLightDispatcher::stopListening()
 {
     Platform::current()->stopListening(WebPlatformEventDeviceLight);
     m_lastDeviceLightData = -1;
 }
 
 void DeviceLightDispatcher::didChangeDeviceLight(double value)
 {
     m_lastDeviceLightData = value;
     notifyControllers();
 }
 
 double DeviceLightDispatcher::latestDeviceLightData() const
 {
     return m_lastDeviceLightData;
 }
 
 } // namespace blink