Fix build failures with ENABLE_OILPAN.

Source/wtf/RawPtr.h

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
 
 private:
     T* m_ptr;
 };
 
 template<typename T, typename U> inline RawPtr<T> static_pointer_cast(const RawPtr<U>& p)
 {
     return RawPtr<T>(static_cast<T*>(p.get()));
 }
 
+template<typename T> inline T* getPtr(const RawPtr<T>& p)
+{
+    return p.get();
+}
+
 } // namespace WTF
 
 using WTF::RawPtr;
 
 #endif