Pass implementation object to supplemental classes by reference

Source/modules/indexeddb/PageGroupIndexedDatabase.cpp

 /*
  * Copyright (C) 2012, 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 26 matching lines @@
 
 PageGroupIndexedDatabase::~PageGroupIndexedDatabase()
 {
 }
 
 const char* PageGroupIndexedDatabase::supplementName()
 {
     return "PageGroupIndexedDatabase";
 }
 
-PageGroupIndexedDatabase* PageGroupIndexedDatabase::from(PageGroup& group)
+PageGroupIndexedDatabase& PageGroupIndexedDatabase::from(PageGroup& group)
 {
-    PageGroupIndexedDatabase* supplement = static_cast<PageGroupIndexedDatabase*>(Supplement<PageGroup>::from(&group, supplementName()));
+    PageGroupIndexedDatabase* supplement = static_cast<PageGroupIndexedDatabase*>(Supplement<PageGroup>::from(group, supplementName()));
     if (!supplement) {
         supplement = new PageGroupIndexedDatabase();
-        provideTo(&group, supplementName(), adoptPtr(supplement));
+        provideTo(group, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
 IDBFactoryBackendInterface* PageGroupIndexedDatabase::factoryBackend()
 {
     // Do not add page setting based access control here since this object is shared by all pages in
     // the group and having per-page controls is misleading.
     if (!m_factoryBackend)
         m_factoryBackend = IDBFactoryBackendInterface::create();
     return m_factoryBackend.get();
 }
 
 } // namespace WebCore