ElementsAccessor::Delete() maybehandlified.

src/elements.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 143 matching lines @@
   // EcmaScript 5.1 15.4.5.2, arrays can be shrunk beyond non-deletable
   // elements. This method should only be called for array expansion OR by
   // runtime JavaScript code that use InternalArrays and don't care about
   // EcmaScript 5.1 semantics.
   virtual void SetCapacityAndLength(
       Handle<JSArray> array,
       int capacity,
       int length) = 0;
 
   // Deletes an element in an object, returning a new elements backing store.
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> holder,
       uint32_t key,
       JSReceiver::DeleteMode mode) = 0;
 
   // If kCopyToEnd is specified as the copy_size to CopyElements, it copies all
   // of elements from source after source_start to the destination array.
   static const int kCopyToEnd = -1;
   // If kCopyToEndAndInitializeToHole is specified as the copy_size to
   // CopyElements, it copies all of elements from source after source_start to
   // destination array, padding any remaining uninitialized elements in the
@@ skipping 82 matching lines @@
 void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t key,
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_