Add HandleScopes and ScriptForbiddenScope::AllowUserAgentScript to private scripts

Source/bindings/templates/methods.cpp

Index: Source/bindings/templates/methods.cpp
diff --git a/Source/bindings/templates/methods.cpp b/Source/bindings/templates/methods.cpp
index c3c1255d3fa852b828ee250deda72b137d0aff8b..81f925078718e57f48a221dbcb0b7b9c37cb5ffa 100644
--- a/Source/bindings/templates/methods.cpp
+++ b/Source/bindings/templates/methods.cpp
@@ -504,6 +504,8 @@ bool {{v8_class}}::{{method.name}}MethodImplementedInPrivateScript({{method.argu
 {
     if (!frame)
         return false;
+    v8::HandleScope handleScope(toIsolate(frame));
+    ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Handle<v8::Context> context = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (context.IsEmpty())
         return false;