Fix name shown by devtools for subclasses.

src/profiler/heap-snapshot-generator.cc

 // Copyright 2013 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/profiler/heap-snapshot-generator.h"
 
 #include "src/code-stubs.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/objects-body-descriptors.h"
@@ skipping 1706 matching lines @@
   int length = js_obj->GetInternalFieldCount();
   for (int i = 0; i < length; ++i) {
     Object* o = js_obj->GetInternalField(i);
     SetInternalReference(
         js_obj, entry, i, o, js_obj->GetInternalFieldOffset(i));
   }
 }
 
 
 String* V8HeapExplorer::GetConstructorName(JSObject* object) {
-  Heap* heap = object->GetHeap();
-  if (object->IsJSFunction()) return heap->closure_string();
-  String* constructor_name = object->constructor_name();
-  if (constructor_name == heap->Object_string()) {
-    // TODO(verwaest): Try to get object.constructor.name in this case.
-    // This requires handlification of the V8HeapExplorer.
-  }
-  return object->constructor_name();
+  Isolate* isolate = object->GetIsolate();
+  if (object->IsJSFunction()) return isolate->heap()->closure_string();
+  DisallowHeapAllocation no_gc;
+  HandleScope scope(isolate);
+  return *JSReceiver::GetConstructorName(handle(object, isolate));
 }
 
 
 HeapEntry* V8HeapExplorer::GetEntry(Object* obj) {
   if (!obj->IsHeapObject()) return NULL;
   return filler_->FindOrAddEntry(obj, this);
 }
 
 
 class RootsReferencesExtractor : public ObjectVisitor {
@@ skipping 1426 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8