Revert "Revert breaking CL"

tools/dom/scripts/systemnative.py

Index: tools/dom/scripts/systemnative.py
diff --git a/tools/dom/scripts/systemnative.py b/tools/dom/scripts/systemnative.py
index 5aa06eef28629804c7a0bf57f0a53cf2eac25eac..1f45b15f68dc40654918ba007261dc558d506f69 100644
--- a/tools/dom/scripts/systemnative.py
+++ b/tools/dom/scripts/systemnative.py
@@ -864,7 +864,7 @@ class DartiumBackend(HtmlDartGenerator):
 
     if requires_script_state:
       body_emitter.Emit(
-          '        ScriptState* currentState = ScriptState::current();\n'
+          '        ScriptState* currentState = DartUtilities::currentScriptState();\n'
           '        if (!currentState) {\n'
           '            exception = Dart_NewStringFromCString("Failed to retrieve a script state");\n'
           '            goto fail;\n'
@@ -891,7 +891,7 @@ class DartiumBackend(HtmlDartGenerator):
       self._cpp_impl_includes.add('"ScriptCallStack.h"')
       body_emitter.Emit(
           '\n'
-          '        ScriptState* currentState = ScriptState::current();\n'
+          '        ScriptState* currentState = DartUtilities::currentScriptState();\n'
           '        if (!currentState) {\n'
           '            exception = Dart_NewStringFromCString("Failed to retrieve a script state");\n'
           '            goto fail;\n'
@@ -914,10 +914,7 @@ class DartiumBackend(HtmlDartGenerator):
           '        Dart_Handle customArgument = Dart_GetNativeArgument(args, $INDEX);\n'
           '        RefPtr<ScriptArguments> scriptArguments(DartUtilities::createScriptArguments(customArgument, exception));\n'
           '        if (!scriptArguments)\n'
-          '            goto fail;\n'
-          '        RefPtr<ScriptCallStack> scriptCallStack(DartUtilities::createScriptCallStack());\n'
-          '        if (!scriptCallStack->size())\n'
-          '            return;\n',
+          '            goto fail;\n',
           INDEX=len(arguments) + 1)
 
     if needs_custom_element_callbacks: