Use attributes to communicate failed lookup instead of retval.

src/objects.h

 // Copyright 2006-2009 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1575 matching lines @@
                                           String* name,
                                           bool continue_search);
 
   // Returns true if most of the elements backing storage is used.
   bool HasDenseElements();
 
   Object* DefineGetterSetter(String* name, PropertyAttributes attributes);
 
   void LookupInDescriptor(String* name, LookupResult* result);
 
-  // Attempts to get property with a named interceptor getter.  Returns
-  // |true| and stores result into |result| if succesful, otherwise
-  // returns |false|
-  bool GetPropertyWithInterceptorProper(JSObject* receiver,
-                                        String* name,
-                                        PropertyAttributes* attributes,
-                                        Object** result);
+  // Attempts to get property with a named interceptor getter.
+  // Sets |attributes| to ABSENT if interceptor didn't return anything
+  Object* GetPropertyWithInterceptorProper(JSObject* receiver,
+                                           String* name,
+                                           PropertyAttributes* attributes);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject);
 };
 
 
 // Abstract super class arrays. It provides length behavior.
 class Array: public HeapObject {
  public:
   // [length]: length of the array.
   inline int length();
@@ skipping 2902 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_