Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/loader/HistoryItem.h

Index: third_party/WebKit/Source/core/loader/HistoryItem.h
diff --git a/third_party/WebKit/Source/core/loader/HistoryItem.h b/third_party/WebKit/Source/core/loader/HistoryItem.h
index 20f7491cb051f38674a046fb545a6d824e76fbed..d77efdbf3791089c9e7224a57bf4a14593eb39b5 100644
--- a/third_party/WebKit/Source/core/loader/HistoryItem.h
+++ b/third_party/WebKit/Source/core/loader/HistoryItem.h
@@ -45,9 +45,9 @@ class EncodedFormData;
 class KURL;
 class ResourceRequest;
 
-class CORE_EXPORT HistoryItem final : public RefCountedWillBeGarbageCollectedFinalized<HistoryItem> {
+class CORE_EXPORT HistoryItem final : public GarbageCollectedFinalized<HistoryItem> {
 public:
-    static PassRefPtrWillBeRawPtr<HistoryItem> create()
+    static RawPtr<HistoryItem> create()
     {
         return adoptRefWillBeNoop(new HistoryItem);
     }
@@ -112,7 +112,7 @@ private:
     IntPoint m_scrollPoint;
     float m_pageScaleFactor;
     Vector<String> m_documentStateVector;
-    RefPtrWillBeMember<DocumentState> m_documentState;
+    Member<DocumentState> m_documentState;
 
     // If two HistoryItems have the same item sequence number, then they are
     // clones of one another. Traversing history from one such HistoryItem to