[runtime] Unify the ToObject handling.

src/messages.cc

 // Copyright 2011 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/messages.h"
 
 #include "src/api.h"
 #include "src/execution.h"
 #include "src/isolate-inl.h"
 #include "src/string-builder.h"
@@ skipping 205 matching lines @@
     if (accessors->IsAccessorPair()) {
       Handle<AccessorPair> pair = Handle<AccessorPair>::cast(accessors);
       return pair->getter() == *fun || pair->setter() == *fun;
     }
   }
   return false;
 }
 
 
 Handle<Object> CallSite::GetMethodName() {
-  MaybeHandle<JSReceiver> maybe = Object::ToObject(isolate_, receiver_);
-  Handle<JSReceiver> receiver;
-  if (!maybe.ToHandle(&receiver) || !receiver->IsJSObject()) {
+  if (receiver_->IsNull() || receiver_->IsUndefined()) {
+    return isolate_->factory()->null_value();
+  }
+  Handle<JSReceiver> receiver =
+      Object::ToObject(isolate_, receiver_).ToHandleChecked();
+  if (!receiver->IsJSObject()) {
     return isolate_->factory()->null_value();
   }
 
   Handle<JSObject> obj = Handle<JSObject>::cast(receiver);
   Handle<Object> function_name(fun_->shared()->name(), isolate_);
   if (function_name->IsName()) {
     Handle<Name> name = Handle<Name>::cast(function_name);
     if (CheckMethodName(isolate_, obj, name, fun_,
                         LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR))
       return name;
@@ skipping 158 matching lines @@
       builder.AppendCharacter(*c);
     }
   }
 
   return builder.Finish();
 }
 
 
 }  // namespace internal
 }  // namespace v8