Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/worklet/Worklet.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Worklet_h
 #define Worklet_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/workers/WorkerScriptLoader.h"
 #include "modules/worklet/WorkletGlobalScope.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ExecutionContext;
 class ScriptPromiseResolver;
 class WorkerScriptLoader;
 
 class Worklet : public GarbageCollectedFinalized<Worklet>, public ScriptWrappable, public ActiveDOMObject {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Worklet);
+    USING_GARBAGE_COLLECTED_MIXIN(Worklet);
     WTF_MAKE_NONCOPYABLE(Worklet);
 public:
     virtual WorkletGlobalScope* workletGlobalScope() const = 0;
 
     // Worklet
     ScriptPromise import(ScriptState*, const String& url);
 
     // ActiveDOMObject
     void stop() final;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     // The ExecutionContext argument is the parent document of the Worklet. The
     // Worklet inherits the url and userAgent from the document.
     explicit Worklet(ExecutionContext*);
 
 private:
     void onResponse();
     void onFinished(WorkerScriptLoader*, ScriptPromiseResolver*);
 
     Vector<RefPtr<WorkerScriptLoader>> m_scriptLoaders;
     HeapVector<Member<ScriptPromiseResolver>> m_resolvers;
 };
 
 } // namespace blink
 
 #endif // Worklet_h