Pass implementation object to supplemental classes by reference

Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp

Index: Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp
diff --git a/Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp b/Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp
index 04fcbae3082725084b6fe780aaba1fa6a19f4794..51ae8f8779f19f92192123c71768e9982d718324 100644
--- a/Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp
+++ b/Source/modules/indexeddb/WorkerGlobalScopeIndexedDatabase.cpp
@@ -48,19 +48,19 @@ const char* WorkerGlobalScopeIndexedDatabase::supplementName()
     return "WorkerGlobalScopeIndexedDatabase";
 }
 
-WorkerGlobalScopeIndexedDatabase* WorkerGlobalScopeIndexedDatabase::from(WorkerSupplementable* context)
+WorkerGlobalScopeIndexedDatabase& WorkerGlobalScopeIndexedDatabase::from(WorkerSupplementable& context)
 {
     WorkerGlobalScopeIndexedDatabase* supplement = static_cast<WorkerGlobalScopeIndexedDatabase*>(WorkerSupplement::from(context, supplementName()));
     if (!supplement) {
         supplement = new WorkerGlobalScopeIndexedDatabase();
         provideTo(context, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
-IDBFactory* WorkerGlobalScopeIndexedDatabase::indexedDB(WorkerSupplementable* context)
+IDBFactory* WorkerGlobalScopeIndexedDatabase::indexedDB(WorkerSupplementable& context)
 {
-    return from(context)->indexedDB();
+    return from(context).indexedDB();
 }
 
 IDBFactory* WorkerGlobalScopeIndexedDatabase::indexedDB()