Teach OrderedHashSet::Remove to report whether it actually removed anything

src/collection.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
@@ skipping 29 matching lines @@
   }
   return %SetHas(this, key);
 }
 
 
 function SetDeleteJS(key) {
   if (!IS_SET(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Set.prototype.delete', this]);
   }
-  if (%SetHas(this, key)) {
-    %SetDelete(this, key);
-    return true;
-  } else {
-    return false;
-  }
+  return %SetDelete(this, key);
 }
 
 
 function SetGetSizeJS() {
   if (!IS_SET(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Set.prototype.size', this]);
   }
   return %SetGetSize(this);
 }
@@ skipping 152 matching lines @@
     "get", MapGetJS,
     "set", MapSetJS,
     "has", MapHasJS,
     "delete", MapDeleteJS,
     "clear", MapClearJS,
     "forEach", MapForEach
   ));
 }
 
 SetUpMap();