Oilpan: Fix ParamStorageTraits for RawPtr<T>.

Source/platform/heap/HeapTest.cpp

 /*
  * Copyright (C) 2013 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 323 matching lines @@
         ++s_destructorCalls;
     }
 
     static int s_destructorCalls;
 
     int value() const { return m_x; }
 
     bool operator==(const OffHeapInt& other) const { return other.value() == value(); }
 
     unsigned hash() { return IntHash<int>::hash(m_x); }
+    void voidFunction() { }
 
 protected:
     OffHeapInt(int x) : m_x(x) { }
 
 private:
     OffHeapInt();
     int m_x;
 };
 
 USED_FROM_MULTIPLE_THREADS(IntWrapper);
@@ skipping 3628 matching lines @@
 {
     Closure closure = bind(&Bar::trace, Bar::create(), static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the Bar.
     EXPECT_EQ(1u, Bar::s_live);
 
     Closure closure2 = bind(&Bar::trace, RawPtr<Bar>(Bar::create()), static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the Bar.
     EXPECT_EQ(2u, Bar::s_live);
+    // RawPtr<OffHeapInt> should not make Persistent.
+    Closure closure3 = bind(&OffHeapInt::voidFunction, RawPtr<OffHeapInt>(OffHeapInt::create(1).get()));
 
     UseMixin::s_traceCount = 0;
     Mixin* mixin = UseMixin::create();
     Closure mixinClosure = bind(&Mixin::trace, mixin, static_cast<Visitor*>(0));
     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack);
     // The closure should have a persistent handle to the mixin.
     EXPECT_EQ(1, UseMixin::s_traceCount);
 }
 
 } // WebCore namespace