Oilpan: Remove most WillBe types from the code base

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

Index: third_party/WebKit/Source/core/page/PageAnimator.h
diff --git a/third_party/WebKit/Source/core/page/PageAnimator.h b/third_party/WebKit/Source/core/page/PageAnimator.h
index 8f4af1099ab4ee9eeb4029a5f820200db250fcef..eb318a4b582b1e87a744091434e90e45c316dc9f 100644
--- a/third_party/WebKit/Source/core/page/PageAnimator.h
+++ b/third_party/WebKit/Source/core/page/PageAnimator.h
@@ -14,9 +14,9 @@ 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);
@@ -30,7 +30,7 @@ public:
 private:
     explicit PageAnimator(Page&);
 
-    RawPtrWillBeMember<Page> m_page;
+    Member<Page> m_page;
     bool m_servicingAnimations;
     bool m_updatingLayoutAndStyleForPainting;
     AnimationClock m_animationClock;