[proxies] Implement [[Delete]].

src/api.cc

 // 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 3861 matching lines @@
   auto self = Utils::OpenHandle(this);
   i::Handle<i::String> name(self->constructor_name());
   return Utils::ToLocal(name);
 }
 
 
 Maybe<bool> v8::Object::Delete(Local<Context> context, Local<Value> key) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, "v8::Object::Delete()", bool);
   auto self = Utils::OpenHandle(this);
   auto key_obj = Utils::OpenHandle(*key);
-  i::Handle<i::Object> obj;
-  has_pending_exception =
-      !i::Runtime::DeleteObjectProperty(isolate, self, key_obj, i::SLOPPY)
-           .ToHandle(&obj);
+  Maybe<bool> result =
+      i::Runtime::DeleteObjectProperty(isolate, self, key_obj, i::SLOPPY);
+  has_pending_exception = result.IsNothing();
   RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
-  return Just(obj->IsTrue());
+  return result;
 }
 
 
 bool v8::Object::Delete(v8::Local<Value> key) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   return Delete(context, key).FromMaybe(false);
 }
 
 
 Maybe<bool> v8::Object::DeletePrivate(Local<Context> context,
@@ skipping 32 matching lines @@
 
 Maybe<bool> v8::Object::HasPrivate(Local<Context> context, Local<Private> key) {
   return HasOwnProperty(context, Local<Name>(reinterpret_cast<Name*>(*key)));
 }
 
 
 Maybe<bool> v8::Object::Delete(Local<Context> context, uint32_t index) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, "v8::Object::DeleteProperty()",
                                   bool);
   auto self = Utils::OpenHandle(this);
-  i::Handle<i::Object> obj;
-  has_pending_exception =
-      !i::JSReceiver::DeleteElement(self, index).ToHandle(&obj);
+  Maybe<bool> result = i::JSReceiver::DeleteElement(self, index);
+  has_pending_exception = result.IsNothing();
   RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
-  return Just(obj->IsTrue());
+  return result;
 }
 
 
 bool v8::Object::Delete(uint32_t index) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   return Delete(context, index).FromMaybe(false);
 }
 
 
 Maybe<bool> v8::Object::Has(Local<Context> context, uint32_t index) {
@@ skipping 4564 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8