Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp

Index: third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp
diff --git a/third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp b/third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp
index 8b3b4740800fcbedf66e70849777e8c306a72eaa..44a18897601bdf4c269e5f04305bbb360ec0cc59 100644
--- a/third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp
+++ b/third_party/WebKit/Source/core/timing/DOMWindowPerformance.cpp
@@ -16,13 +16,11 @@ DOMWindowPerformance::DOMWindowPerformance(LocalDOMWindow& window)
 {
 }
 
-DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowPerformance);
-
 DEFINE_TRACE(DOMWindowPerformance)
 {
     visitor->trace(m_window);
     visitor->trace(m_performance);
-    WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
+    HeapSupplement<LocalDOMWindow>::trace(visitor);
     DOMWindowProperty::trace(visitor);
 }
 
@@ -35,7 +33,7 @@ const char* DOMWindowPerformance::supplementName()
 // static
 DOMWindowPerformance& DOMWindowPerformance::from(LocalDOMWindow& window)
 {
-    DOMWindowPerformance* supplement = static_cast<DOMWindowPerformance*>(WillBeHeapSupplement<LocalDOMWindow>::from(window, supplementName()));
+    DOMWindowPerformance* supplement = static_cast<DOMWindowPerformance*>(HeapSupplement<LocalDOMWindow>::from(window, supplementName()));
     if (!supplement) {
         supplement = new DOMWindowPerformance(window);
         provideTo(window, supplementName(), adoptPtrWillBeNoop(supplement));