Oilpan: cleanup based on review comments after removal of TreeShared.

Source/wtf/PassRefPtr.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  *  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 120 matching lines @@
     template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, U* b)
     {
         return a.get() == b;
     }
 
     template<typename T, typename U> inline bool operator==(T* a, const PassRefPtr<U>& b)
     {
         return a == b.get();
     }
 
+    template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const U& b)
+    {
+        return a.get() == &b;
+    }
+
+    template<typename T, typename U> inline bool operator==(const T& a, const PassRefPtr<U>& b)
+    {
+        return &a == b.get();
+    }
+
     template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const RawPtr<U>& b)
     {
         return a.get() == b.get();
     }
 
     template<typename T, typename U> inline bool operator==(const RawPtr<T>& a, const PassRefPtr<U>& b)
     {
         return a.get() == b.get();
     }
 
@@ skipping 15 matching lines @@
     template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, U* b)
     {
         return a.get() != b;
     }
 
     template<typename T, typename U> inline bool operator!=(T* a, const PassRefPtr<U>& b)
     {
         return a != b.get();
     }
 
+    template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const U& b)
+    {
+        return a.get() != &b;
+    }
+
+    template<typename T, typename U> inline bool operator!=(const T& a, const PassRefPtr<U>& b)
+    {
+        return &a != b.get();
+    }
+
     template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const RawPtr<U>& b)
     {
         return a.get() != b.get();
     }
 
     template<typename T, typename U> inline bool operator!=(const RawPtr<T>& a, const PassRefPtr<U>& b)
     {
         return a.get() != b.get();
     }
 
@@ skipping 13 matching lines @@
         return p.get();
     }
 
 } // namespace WTF
 
 using WTF::PassRefPtr;
 using WTF::adoptRef;
 using WTF::static_pointer_cast;
 
 #endif // WTF_PassRefPtr_h