Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/presentation/PresentationReceiver.h

 // Copyright 2015 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 PresentationReceiver_h
 #define PresentationReceiver_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/heap/Handle.h"
 #include "platform/heap/Heap.h"
 
 namespace blink {
 
 // Implements the PresentationReceiver interface from the Presentation API from
 // which websites can implement the receiving side of a presentation session.
 class PresentationReceiver final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<PresentationReceiver>
     , DOMWindowProperty {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(PresentationReceiver);
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PresentationReceiver);
+    USING_GARBAGE_COLLECTED_MIXIN(PresentationReceiver);
     DEFINE_WRAPPERTYPEINFO();
 public:
     PresentationReceiver(LocalFrame*);
     ~PresentationReceiver() = default;
 
     // EventTarget implementation.
     const AtomicString& interfaceName() const override;
     ExecutionContext* getExecutionContext() const override;
 
     ScriptPromise getConnection(ScriptState*);
     ScriptPromise getConnections(ScriptState*);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(connectionavailable);
 
     DECLARE_VIRTUAL_TRACE();
 };
 
 } // namespace blink
 
 #endif // PresentationReceiver_h