[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 3014efe2b2db0ff752893c819e0c23a2b1b8fcba..ec062c08203c647df82ba7ffca1120a978e96110 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,