Remove hidden prototype for builtin functions.

src/array.js

 // Copyright 2010 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 1367 matching lines @@
     if (!IS_UNDEFINED(len)) {
       %FunctionSetLength(f, len);
     }
     return f;
   }
 
   // Set up non-enumerable functions of the Array.prototype object and
   // set their names.
   // Manipulate the length of some of the functions to meet
   // expectations set by ECMA-262 or Mozilla.
-  InstallFunctionsOnHiddenPrototype($Array.prototype, DONT_ENUM, $Array(
+  InstallFunctions($Array.prototype, DONT_ENUM, $Array(
     "toString", getFunction("toString", ArrayToString),
     "toLocaleString", getFunction("toLocaleString", ArrayToLocaleString),
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush, 1),
     "concat", getFunction("concat", ArrayConcat, 1),
     "reverse", getFunction("reverse", ArrayReverse),
     "shift", getFunction("shift", ArrayShift),
     "unshift", getFunction("unshift", ArrayUnshift, 1),
     "slice", getFunction("slice", ArraySlice, 2),
@@ skipping 16 matching lines @@
   // exposed to user code.
   // Adding only the functions that are actually used.
   SetUpLockedPrototype(InternalArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();