Integrate user strings into the JSON policy template file

tools/grit/grit/format/policy_templates/writers/json_writer.py

Index: tools/grit/grit/format/policy_templates/writers/json_writer.py
diff --git a/tools/grit/grit/format/policy_templates/writers/json_writer.py b/tools/grit/grit/format/policy_templates/writers/json_writer.py
index 7eda7fa0202dbddbb02f94f447eca14ce2db6b9b..a754305bab79c1a4f2e35086cd5ef34f393fdb5e 100644
--- a/tools/grit/grit/format/policy_templates/writers/json_writer.py
+++ b/tools/grit/grit/format/policy_templates/writers/json_writer.py
@@ -7,12 +7,12 @@ from xml.dom import minidom
 from grit.format.policy_templates.writers import template_writer
 
 
-def GetWriter(config, messages):
+def GetWriter(config):
   '''Factory method for creating JsonWriter objects.
   See the constructor of TemplateWriter for description of
   arguments.
   '''
-  return JsonWriter(['linux'], config, messages)
+  return JsonWriter(['linux'], config)
 
 
 class JsonWriter(template_writer.TemplateWriter):