Revert "Handlify DescriptorArray::Merge()."

src/objects.h

 // Copyright 2012 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 3370 matching lines @@
   void CopyFrom(int dst_index,
                 DescriptorArray* src,
                 int src_index,
                 const WhitenessWitness&);
   static Handle<DescriptorArray> Merge(Handle<DescriptorArray> desc,
                                        int verbatim,
                                        int valid,
                                        int new_size,
                                        int modify_index,
                                        StoreMode store_mode,
-                                       Handle<DescriptorArray> other)
-      V8_WARN_UNUSED_RESULT;
+                                       Handle<DescriptorArray> other);
+  MUST_USE_RESULT MaybeObject* Merge(int verbatim,
+                                     int valid,
+                                     int new_size,
+                                     int modify_index,
+                                     StoreMode store_mode,
+                                     DescriptorArray* other);
 
   bool IsMoreGeneralThan(int verbatim,
                          int valid,
                          int new_size,
                          DescriptorArray* other);
 
   MUST_USE_RESULT MaybeObject* CopyUpTo(int enumeration_index) {
     return CopyUpToAddAttributes(enumeration_index, NONE);
   }
 
@@ skipping 7359 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_