Get rid of usages of ScriptWrappable::wrapper().

Source/bindings/v8/ScriptWrappable.h

 /*
  * Copyright (C) 2010 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScriptWrappable_h
 #define ScriptWrappable_h
 
+#include "bindings/v8/UnsafePersistent.h"
 #include "bindings/v8/V8Utilities.h"
 #include "bindings/v8/WrapperTypeInfo.h"
 #include "core/dom/WebCoreMemoryInstrumentation.h"
 #include <v8.h>
 
 namespace WebCore {
 
 class ScriptWrappable : public MemoryReporterTag {
     friend class WeakHandleListener<ScriptWrappable>;
 public:
@@ skipping 101 matching lines @@
     }
 
 protected:
     ~ScriptWrappable()
     {
         ASSERT(m_maskedStorage);  // Assert initialization via init() even if not subsequently wrapped.
         m_maskedStorage = 0;      // Break UAF attempts to wrap.
     }
 
 private:
+    friend class MinorGCWrapperVisitor; // For calling unsafePersistent.
+
+    UnsafePersistent<v8::Object> unsafePersistent() const
+    {
+        ASSERT(containsWrapper());
+        return UnsafePersistent<v8::Object>(reinterpret_cast<v8::Object*>(maskOrUnmaskValue(m_maskedStorage)));
+    }
+
     inline bool containsWrapper() const { return (m_maskedStorage & 1) == 1; }
     inline bool containsTypeInfo() const { return m_maskedStorage && ((m_maskedStorage & 1) == 0); }
 
     static inline uintptr_t maskOrUnmaskValue(uintptr_t value)
     {
         // Entropy via ASLR, bottom bit set to always toggle the bottom bit in the result. Since masking is only
         // applied to wrappers, not wrapper type infos, and these are aligned poitners with zeros in the bottom
         // bit(s), this automatically set the wrapper flag in the bottom bit upon encoding. Simiarlry,this
         // automatically zeros out the bit upon decoding. Additionally, since setWrapper() now performs an explicit
         // null test, and wrapper() requires the bottom bit to be set, there is no need to preserve null here.
@@ skipping 32 matching lines @@
     key->disposeWrapper(value, isolate, info);
     // FIXME: I noticed that 50%~ of minor GC cycle times can be consumed
     // inside key->deref(), which causes Node destructions. We should
     // make Node destructions incremental.
     info->derefObject(object);
 }
 
 } // namespace WebCore
 
 #endif // ScriptWrappable_h