Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/mediarecorder/BlobEvent.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 BlobEvent_h
 #define BlobEvent_h
 
 #include "core/fileapi/Blob.h"
 #include "modules/EventModules.h"
 #include "modules/ModulesExport.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class Blob;
 class BlobEventInit;
 
 class MODULES_EXPORT BlobEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     ~BlobEvent() override {}
 
-    static PassRefPtrWillBeRawPtr<BlobEvent> create();
-    static PassRefPtrWillBeRawPtr<BlobEvent> create(const AtomicString& type, const BlobEventInit& initializer);
-    static PassRefPtrWillBeRawPtr<BlobEvent> create(const AtomicString& type, Blob*);
+    static RawPtr<BlobEvent> create();
+    static RawPtr<BlobEvent> create(const AtomicString& type, const BlobEventInit& initializer);
+    static RawPtr<BlobEvent> create(const AtomicString& type, Blob*);
 
     Blob* data() const { return m_blob.get(); }
 
     // Event
     const AtomicString& interfaceName() const final;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     BlobEvent() {}
     BlobEvent(const AtomicString& type, const BlobEventInit& initializer);
     BlobEvent(const AtomicString& type, Blob*);
 
-    PersistentWillBeMember<Blob> m_blob;
+    Member<Blob> m_blob;
 };
 
 } // namespace blink
 
 #endif // BlobEvent_h