Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/device_light/DeviceLightDispatcher.cpp

Index: Source/modules/device_light/DeviceLightDispatcher.cpp
diff --git a/Source/modules/device_light/DeviceLightDispatcher.cpp b/Source/modules/device_light/DeviceLightDispatcher.cpp
index d56a0a03d95d705c0a6e799d277596521f511f88..eda852be5a35daa151c0155443f6f2f5009d7737 100644
--- a/Source/modules/device_light/DeviceLightDispatcher.cpp
+++ b/Source/modules/device_light/DeviceLightDispatcher.cpp
@@ -12,8 +12,8 @@ namespace blink {
 
 DeviceLightDispatcher& DeviceLightDispatcher::instance()
 {
-    DEFINE_STATIC_LOCAL(DeviceLightDispatcher, deviceLightDispatcher, ());
-    return deviceLightDispatcher;
+    DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<DeviceLightDispatcher>, deviceLightDispatcher, (adoptPtrWillBeNoop(new DeviceLightDispatcher())));
+    return *deviceLightDispatcher;
 }
 
 DeviceLightDispatcher::DeviceLightDispatcher()
@@ -25,6 +25,11 @@ DeviceLightDispatcher::~DeviceLightDispatcher()
 {
 }
 
+void DeviceLightDispatcher::trace(Visitor* visitor)
+{
+    PlatformEventDispatcher::trace(visitor);
+}
+
 void DeviceLightDispatcher::startListening()
 {
     Platform::current()->startListening(WebPlatformEventDeviceLight, this);