Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/page/PageAnimator.h

 // Copyright 2014 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 PageAnimator_h
 #define PageAnimator_h
 
 #include "core/CoreExport.h"
 #include "core/animation/AnimationClock.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalFrame;
 class Page;
 
-class CORE_EXPORT PageAnimator final : public RefCountedWillBeGarbageCollected<PageAnimator> {
+class CORE_EXPORT PageAnimator final : public GarbageCollected<PageAnimator> {
 public:
-    static PassRefPtrWillBeRawPtr<PageAnimator> create(Page&);
+    static RawPtr<PageAnimator> create(Page&);
     DECLARE_TRACE();
     void scheduleVisualUpdate(LocalFrame*);
     void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
     bool isServicingAnimations() const { return m_servicingAnimations; }
 
     // See documents of methods with the same names in FrameView class.
     void updateAllLifecyclePhases(LocalFrame& rootFrame);
     AnimationClock& clock() { return m_animationClock; }
 
 private:
     explicit PageAnimator(Page&);
 
-    RawPtrWillBeMember<Page> m_page;
+    Member<Page> m_page;
     bool m_servicingAnimations;
     bool m_updatingLayoutAndStyleForPainting;
     AnimationClock m_animationClock;
 };
 
 } // namespace blink
 
 #endif // PageAnimator_h