bindings: Don't throw a TypeError when 'null' is passed to nullable callback function

third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp

Index: third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp
index 55ce233c7ed5a419c7dcf8396a0232c1e0d63acb..3519ad6f845a6c684a813203f37bdfaa9f022bca 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp
+++ b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.cpp
@@ -22,6 +22,13 @@
 
 namespace blink {
 
+// static
+VoidCallbackFunctionInterfaceArg* VoidCallbackFunctionInterfaceArg::create(ScriptState* scriptState, v8::Local<v8::Value> callback){
+  if (isUndefinedOrNull(callback))
+    return nullptr;
+  return new VoidCallbackFunctionInterfaceArg(scriptState, v8::Local<v8::Function>::Cast(callback));
+}
+
 VoidCallbackFunctionInterfaceArg::VoidCallbackFunctionInterfaceArg(ScriptState* scriptState, v8::Local<v8::Function> callback)
     : m_scriptState(scriptState),
     m_callback(scriptState->isolate(), this, callback) {