Pass implementation object to supplemental classes by reference

Source/platform/RefCountedSupplement.h

Index: Source/platform/RefCountedSupplement.h
diff --git a/Source/platform/RefCountedSupplement.h b/Source/platform/RefCountedSupplement.h
index 6de6a04aa9f74035ebb474cff106baf79f76fa2c..6613a3b8c9de86bf7eda5d2d7b167121aa9d4fb3 100644
--- a/Source/platform/RefCountedSupplement.h
+++ b/Source/platform/RefCountedSupplement.h
@@ -53,14 +53,14 @@ public:
         RefPtr<ThisType> m_wrapped;
     };
 
-    static void provideTo(Supplementable<T>* host, const char* key, PassRefPtr<ThisType> supplement)
+    static void provideTo(Supplementable<T>& host, const char* key, PassRefPtr<ThisType> supplement)
     {
-        host->provideSupplement(key, adoptPtr(new Wrapper(supplement)));
+        host.provideSupplement(key, adoptPtr(new Wrapper(supplement)));
     }
 
-    static ThisType* from(Supplementable<T>* host, const char* key)
+    static ThisType* from(Supplementable<T>& host, const char* key)
     {
-        Supplement<T>* found = host->requireSupplement(key);
+        Supplement<T>* found = host.requireSupplement(key);
         if (!found)
             return 0;
         ASSERT_WITH_SECURITY_IMPLICATION(found->isRefCountedWrapper());