Pass implementation object to supplemental classes by reference

Source/modules/performance/SharedWorkerPerformance.cpp

 /*
  * Copyright (c) 2014, Opera Software ASA. 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 34 matching lines @@
 
 SharedWorkerPerformance::~SharedWorkerPerformance()
 {
 }
 
 const char* SharedWorkerPerformance::supplementName()
 {
     return "SharedWorkerPerformance";
 }
 
-SharedWorkerPerformance* SharedWorkerPerformance::from(SharedWorker* sharedWorker)
+SharedWorkerPerformance& SharedWorkerPerformance::from(SharedWorker& sharedWorker)
 {
     SharedWorkerPerformance* supplement = static_cast<SharedWorkerPerformance*>(Supplement<SharedWorker>::from(sharedWorker, supplementName()));
     if (!supplement) {
         supplement = new SharedWorkerPerformance();
         provideTo(sharedWorker, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
-double SharedWorkerPerformance::workerStart(ExecutionContext* context, SharedWorker* sharedWorker)
+double SharedWorkerPerformance::workerStart(ExecutionContext* context, SharedWorker& sharedWorker)
 {
-    return SharedWorkerPerformance::from(sharedWorker)->getWorkerStart(context, sharedWorker);
+    return SharedWorkerPerformance::from(sharedWorker).getWorkerStart(context, sharedWorker);
 }
 
-double SharedWorkerPerformance::getWorkerStart(ExecutionContext* context, SharedWorker* sharedWorker) const
+double SharedWorkerPerformance::getWorkerStart(ExecutionContext* context, SharedWorker&) const
 {
     ASSERT(context);
     ASSERT(context->isDocument());
     Document* document = toDocument(context);
     if (!document->loader())
         return 0;
 
     double navigationStart = document->loader()->timing()->navigationStart();
     return m_timeOrigin - navigationStart;
 }
 
 } // namespace WebCore