Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.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 RemotePlayback_h
 #define RemotePlayback_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/remoteplayback/WebRemotePlaybackClient.h"
 #include "public/platform/modules/remoteplayback/WebRemotePlaybackState.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExecutionContext;
 class HTMLMediaElement;
 class LocalFrame;
 class RemotePlaybackAvailability;
 
 class RemotePlayback final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<RemotePlayback>
     , public DOMWindowProperty
     , private WebRemotePlaybackClient {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(RemotePlayback);
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RemotePlayback);
+    USING_GARBAGE_COLLECTED_MIXIN(RemotePlayback);
 public:
     static RemotePlayback* create(HTMLMediaElement&);
 
     ~RemotePlayback() override = default;
 
     // EventTarget implementation.
     const WTF::AtomicString& interfaceName() const override;
     ExecutionContext* getExecutionContext() const override;
 
     ScriptPromise getAvailability(ScriptState*);
@@ skipping 11 matching lines @@
     void availabilityChanged(bool available) override;
 
     WebRemotePlaybackState m_state;
     bool m_availability;
     HeapVector<Member<RemotePlaybackAvailability>> m_availabilityObjects;
 };
 
 } // namespace blink
 
 #endif // RemotePlayback_h