Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/CSSCustomFontData.h

 /*
  * Copyright (C) 2013 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 51 matching lines @@
         : m_fontFaceSource(source)
         , m_fallbackVisibility(visibility)
         , m_isLoading(false)
     {
         if (source)
             m_isLoading = source->isLoading();
     }
 
     // TODO(Oilpan): consider moving (Custom)FontFace hierarchy to the heap,
     // thereby making this reference a Member<>.
-    RawPtrWillBeWeakPersistent<RemoteFontFaceSource> m_fontFaceSource;
+    WeakPersistent<RemoteFontFaceSource> m_fontFaceSource;
     FallbackVisibility m_fallbackVisibility;
     mutable bool m_isLoading;
 };
 
 } // namespace blink
 
 #endif // CSSCustomFontData_h