[oilpan] The Node hierarchy should have correct accept method chains

Source/heap/Handle.h

Index: Source/heap/Handle.h
diff --git a/Source/heap/Handle.h b/Source/heap/Handle.h
index 9078c47ad434e401194a2e4ddeeb3b5ad3a05c92..4cbc6873f40fa3d5ec3ffad4f8962f461b631b9a 100644
--- a/Source/heap/Handle.h
+++ b/Source/heap/Handle.h
@@ -762,17 +762,6 @@ public:
         return releaseRaw() ? &Result::m_raw : 0;
     }
 
-    // FIXME(oilpan): Make this private.
-    T* releaseRaw() const
-    {
-        T* raw = m_raw;
-        m_raw = 0;
-#ifndef NDEBUG
-        m_doNotAllocate.release();
-#endif
-        return raw;
-    }
-
     // FIXME(oilpan): Remove once TreeShared no longer requires reference counting.
     PassRefPtr<T> passRefPtr() const
     {
@@ -788,6 +777,16 @@ private:
     {
     }
 
+    T* releaseRaw() const
+    {
+        T* raw = m_raw;
+        m_raw = 0;
+#ifndef NDEBUG
+        m_doNotAllocate.release();
+#endif
+        return raw;
+    }
+
     // Mutable to allow raw() to steal the pointer when creating a
     // Handle from the Result.
     mutable T* m_raw;
@@ -963,6 +962,12 @@ public:
     }
 
     template<typename U>
+    bool operator!=(const Handle<U>& other) const
+    {
+        return other.raw() != raw();
+    }
+
+    template<typename U>
     bool operator==(const Persistent<U>& other) const
     {
         return other.raw() == raw();