Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/webgl/WebGLContextObject.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 46 matching lines @@
     explicit WebGLContextObject(WebGLRenderingContextBase*);
 
     bool hasGroupOrContext() const final
     {
         return m_context;
     }
 
     gpu::gles2::GLES2Interface* getAGLInterface() const final;
 
 private:
-    RawPtrWillBeMember<WebGLRenderingContextBase> m_context;
+    Member<WebGLRenderingContextBase> m_context;
 };
 
 } // namespace blink
 
 #endif // WebGLContextObject_h