Pass implementation object to supplemental classes by reference

Source/modules/gamepad/NavigatorGamepad.cpp

 /*
  * Copyright (C) 2011, 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 52 matching lines @@
 
 NavigatorGamepad::~NavigatorGamepad()
 {
 }
 
 const char* NavigatorGamepad::supplementName()
 {
     return "NavigatorGamepad";
 }
 
-NavigatorGamepad* NavigatorGamepad::from(Navigator* navigator)
+NavigatorGamepad& NavigatorGamepad::from(Navigator& navigator)
 {
     NavigatorGamepad* supplement = static_cast<NavigatorGamepad*>(Supplement<Navigator>::from(navigator, supplementName()));
     if (!supplement) {
         supplement = new NavigatorGamepad();
         provideTo(navigator, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
-GamepadList* NavigatorGamepad::webkitGetGamepads(Navigator* navigator)
+GamepadList* NavigatorGamepad::webkitGetGamepads(Navigator& navigator)
 {
-    return NavigatorGamepad::from(navigator)->gamepads();
+    return NavigatorGamepad::from(navigator).gamepads();
 }
 
 GamepadList* NavigatorGamepad::gamepads()
 {
     if (!m_gamepads)
         m_gamepads = GamepadList::create();
     sampleGamepads(m_gamepads.get());
     return m_gamepads.get();
 }
 
 } // namespace WebCore