Fix memory leak in AsyncExtensionFunction.

chrome/browser/extensions/execute_code_in_tab_function.cc

Index: chrome/browser/extensions/execute_code_in_tab_function.cc
diff --git a/chrome/browser/extensions/execute_code_in_tab_function.cc b/chrome/browser/extensions/execute_code_in_tab_function.cc
index 989d5f2ac549e84dc5bb72bb2ac50d0ef03d820a..98bd3be8bb2d43203af31409277face1f1fc3d31 100644
--- a/chrome/browser/extensions/execute_code_in_tab_function.cc
+++ b/chrome/browser/extensions/execute_code_in_tab_function.cc
@@ -20,7 +20,7 @@ const wchar_t* kFileKey = L"file";
 
 bool ExecuteCodeInTabFunction::RunImpl() {
   EXTENSION_FUNCTION_VALIDATE(args_->IsType(Value::TYPE_LIST));
-  const ListValue* args = static_cast<const ListValue*>(args_);
+  const ListValue* args = args_as_list();
 
   DictionaryValue* script_info;
   EXTENSION_FUNCTION_VALIDATE(args->GetDictionary(1, &script_info));