Pass implementation object to supplemental classes by reference

Source/modules/performance/WorkerGlobalScopePerformance.cpp

Index: Source/modules/performance/WorkerGlobalScopePerformance.cpp
diff --git a/Source/modules/performance/WorkerGlobalScopePerformance.cpp b/Source/modules/performance/WorkerGlobalScopePerformance.cpp
index 94939d9b9dbe15f78d08e05662a0f1df30c3f3f2..1ecd5be35c3ea0087b287beb279a106a4b2eceb0 100644
--- a/Source/modules/performance/WorkerGlobalScopePerformance.cpp
+++ b/Source/modules/performance/WorkerGlobalScopePerformance.cpp
@@ -50,19 +50,19 @@ const char* WorkerGlobalScopePerformance::supplementName()
     return "WorkerGlobalScopePerformance";
 }
 
-WorkerGlobalScopePerformance* WorkerGlobalScopePerformance::from(WorkerGlobalScope* context)
+WorkerGlobalScopePerformance& WorkerGlobalScopePerformance::from(WorkerGlobalScope& context)
 {
     WorkerGlobalScopePerformance* supplement = static_cast<WorkerGlobalScopePerformance*>(WorkerSupplement::from(context, supplementName()));
     if (!supplement) {
         supplement = new WorkerGlobalScopePerformance();
         provideTo(context, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
-WorkerPerformance* WorkerGlobalScopePerformance::performance(WorkerGlobalScope* context)
+WorkerPerformance* WorkerGlobalScopePerformance::performance(WorkerGlobalScope& context)
 {
-    return from(context)->performance();
+    return from(context).performance();
 }
 
 WorkerPerformance* WorkerGlobalScopePerformance::performance()