Emit error events if the loading of an object element failed

components/plugins/renderer/plugin_placeholder.cc

Index: components/plugins/renderer/plugin_placeholder.cc
diff --git a/components/plugins/renderer/plugin_placeholder.cc b/components/plugins/renderer/plugin_placeholder.cc
index a643433b1efc943aab4f9556bad23d8507dd4973..8d11e55a934d9c7520a778727cb496998f8ed859 100644
--- a/components/plugins/renderer/plugin_placeholder.cc
+++ b/components/plugins/renderer/plugin_placeholder.cc
@@ -138,6 +138,10 @@ v8::Local<v8::Value> PluginPlaceholder::GetV8Handle(v8::Isolate* isolate) {
   return gin::CreateHandle(isolate, this).ToV8();
 }
 
+bool PluginPlaceholderBase::IsErrorPlaceholder() {
+  return false;
+}
+
 gin::ObjectTemplateBuilder PluginPlaceholder::GetObjectTemplateBuilder(
     v8::Isolate* isolate) {
   return gin::Wrappable<PluginPlaceholder>::GetObjectTemplateBuilder(isolate)