Oilpan: Remove unused destructor from non-finalized SharedWorkerPerformance.

Source/modules/performance/SharedWorkerPerformance.h

Index: Source/modules/performance/SharedWorkerPerformance.h
diff --git a/Source/modules/performance/SharedWorkerPerformance.h b/Source/modules/performance/SharedWorkerPerformance.h
index c4d3a94a1c9e8b84177401afb091deda111147a0..0fcf977550b9b81accfd084957438e39be8c3931 100644
--- a/Source/modules/performance/SharedWorkerPerformance.h
+++ b/Source/modules/performance/SharedWorkerPerformance.h
@@ -41,7 +41,6 @@ class SharedWorker;
 class SharedWorkerPerformance FINAL : public NoBaseWillBeGarbageCollected<SharedWorkerPerformance>, public WillBeHeapSupplement<SharedWorker> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SharedWorkerPerformance);
 public:
-    virtual ~SharedWorkerPerformance();
     static SharedWorkerPerformance& from(SharedWorker&);
 
     static double workerStart(ExecutionContext*, SharedWorker&);