Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/editing/serializers/TextOffset.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 TextOffset_h
 #define TextOffset_h
 
 #include "public/platform/Platform.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class Text;
 
 class TextOffset {
     STACK_ALLOCATED();
 public:
     TextOffset();
-    TextOffset(PassRefPtrWillBeRawPtr<Text>, int);
+    TextOffset(RawPtr<Text>, int);
     TextOffset(const TextOffset&);
 
     Text* text() const { return m_text.get(); }
     int offset() const { return m_offset; }
 
     bool isNull() const;
     bool isNotNull() const;
 
 private:
-    RefPtrWillBeMember<Text> m_text;
+    Member<Text> m_text;
     int m_offset;
 };
 
 } // namespace blink
 
 #endif // TextOffset_h