Oilpan: move WorkerGlobalScope to oilpan's heap.

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 1ecd5be35c3ea0087b287beb279a106a4b2eceb0..e0c3b7d5c7f35bcca34cd50dd900c1367bb0acf9 100644
--- a/Source/modules/performance/WorkerGlobalScopePerformance.cpp
+++ b/Source/modules/performance/WorkerGlobalScopePerformance.cpp
@@ -55,7 +55,7 @@ WorkerGlobalScopePerformance& WorkerGlobalScopePerformance::from(WorkerGlobalSco
     WorkerGlobalScopePerformance* supplement = static_cast<WorkerGlobalScopePerformance*>(WorkerSupplement::from(context, supplementName()));
     if (!supplement) {
         supplement = new WorkerGlobalScopePerformance();
-        provideTo(context, supplementName(), adoptPtr(supplement));
+        provideTo(context, supplementName(), adoptPtrWillBeNoop(supplement));
     }
     return *supplement;
 }
@@ -72,4 +72,9 @@ WorkerPerformance* WorkerGlobalScopePerformance::performance()
     return m_performance.get();
 }
 
+void WorkerGlobalScopePerformance::trace(Visitor* visitor)
+{
+    visitor->trace(m_performance);
+}
+
 } // namespace WebCore