[Extensions Bindings] Notify of event unregistration on invalidation

extensions/renderer/api_bindings_system.cc

Index: extensions/renderer/api_bindings_system.cc
diff --git a/extensions/renderer/api_bindings_system.cc b/extensions/renderer/api_bindings_system.cc
index fab9fe83ce96f6ea7e64304fb6989b6bd3b43e86..10f20851335341463483647cacdf842d86c576b1 100644
--- a/extensions/renderer/api_bindings_system.cc
+++ b/extensions/renderer/api_bindings_system.cc
@@ -124,6 +124,10 @@ void APIBindingsSystem::RegisterCustomType(const std::string& type_name,
   custom_types_[type_name] = function;
 }
 
+void APIBindingsSystem::WillReleaseContext(v8::Local<v8::Context> context) {
+  event_handler_.InvalidateContext(context);
+}
+
 v8::Local<v8::Object> APIBindingsSystem::CreateCustomType(
     v8::Local<v8::Context> context,
     const std::string& type_name,