Pass implementation object to supplemental classes by reference

Source/modules/device_orientation/DeviceOrientationController.h

Index: Source/modules/device_orientation/DeviceOrientationController.h
diff --git a/Source/modules/device_orientation/DeviceOrientationController.h b/Source/modules/device_orientation/DeviceOrientationController.h
index 401963ecf0b674131686d93069268d9a5eb7294a..71484c63335a3befe23ac733983bf638407d7df8 100644
--- a/Source/modules/device_orientation/DeviceOrientationController.h
+++ b/Source/modules/device_orientation/DeviceOrientationController.h
@@ -42,7 +42,7 @@ public:
     virtual ~DeviceOrientationController();
 
     static const char* supplementName();
-    static DeviceOrientationController* from(Document*);
+    static DeviceOrientationController& from(Document&);
 
     void didChangeDeviceOrientation(WebCore::DeviceOrientationData*);
 
@@ -52,7 +52,7 @@ public:
     virtual void didRemoveAllEventListeners(DOMWindow*) OVERRIDE;
 
 private:
-    explicit DeviceOrientationController(Document*);
+    explicit DeviceOrientationController(Document&);
     virtual void registerWithDispatcher() OVERRIDE;
     virtual void unregisterWithDispatcher() OVERRIDE;