Pass implementation object to supplemental classes by reference

Source/modules/screen_orientation/ScreenOrientation.cpp

Index: Source/modules/screen_orientation/ScreenOrientation.cpp
diff --git a/Source/modules/screen_orientation/ScreenOrientation.cpp b/Source/modules/screen_orientation/ScreenOrientation.cpp
index 4b147dd809a0f4ee807ee0cd9fb9fe5145c8ce0e..d7723c404b39d3519bc3ef3bd7b0458104acd68f 100644
--- a/Source/modules/screen_orientation/ScreenOrientation.cpp
+++ b/Source/modules/screen_orientation/ScreenOrientation.cpp
@@ -11,8 +11,8 @@
 
 namespace WebCore {
 
-ScreenOrientation::ScreenOrientation(Screen* screen)
-    : DOMWindowProperty(screen->frame())
+ScreenOrientation::ScreenOrientation(Screen& screen)
+    : DOMWindowProperty(screen.frame())
 {
 }
 
@@ -21,15 +21,14 @@ const char* ScreenOrientation::supplementName()
     return "ScreenOrientation";
 }
 
-ScreenOrientation* ScreenOrientation::from(Screen* screen)
+ScreenOrientation& ScreenOrientation::from(Screen& screen)
 {
     ScreenOrientation* supplement = static_cast<ScreenOrientation*>(Supplement<Screen>::from(screen, supplementName()));
     if (!supplement) {
-        ASSERT(screen);
         supplement = new ScreenOrientation(screen);
         provideTo(screen, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
 ScreenOrientation::~ScreenOrientation()
@@ -45,26 +44,26 @@ Screen* ScreenOrientation::screen() const
     return window->screen();
 }
 
-const AtomicString& ScreenOrientation::orientation(Screen* screen)
+const AtomicString& ScreenOrientation::orientation(Screen& screen)
 {
     // FIXME: Implement.
     DEFINE_STATIC_LOCAL(const AtomicString, portraitPrimary, ("portrait-primary", AtomicString::ConstructFromLiteral));
     return portraitPrimary;
 }
 
-bool ScreenOrientation::lockOrientation(Screen* screen, const Vector<String>& orientations)
+bool ScreenOrientation::lockOrientation(Screen& screen, const Vector<String>& orientations)
 {
     // FIXME: Implement.
     return false;
 }
 
-bool ScreenOrientation::lockOrientation(Screen* screen, const AtomicString& orientation)
+bool ScreenOrientation::lockOrientation(Screen& screen, const AtomicString& orientation)
 {
     // FIXME: Implement.
     return false;
 }
 
-void ScreenOrientation::unlockOrientation(Screen* screen)
+void ScreenOrientation::unlockOrientation(Screen& screen)
 {
     // FIXME: Implement.
 }