Integrate user strings into the JSON policy template file

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

Index: tools/grit/grit/format/policy_templates/writers/plist_writer.py
diff --git a/tools/grit/grit/format/policy_templates/writers/plist_writer.py b/tools/grit/grit/format/policy_templates/writers/plist_writer.py
index 87e9db95735dd4ca789f631428ee316a13c71b8d..848ea37b028993519063297bdc91bc5e7cc74870 100644
--- a/tools/grit/grit/format/policy_templates/writers/plist_writer.py
+++ b/tools/grit/grit/format/policy_templates/writers/plist_writer.py
@@ -8,12 +8,12 @@ from grit.format.policy_templates.writers import plist_helper
 from grit.format.policy_templates.writers import xml_formatted_writer
 
 
-def GetWriter(config, messages):
+def GetWriter(config):
   '''Factory method for creating PListWriter objects.
   See the constructor of TemplateWriter for description of
   arguments.
   '''
-  return PListWriter(['mac'], config, messages)
+  return PListWriter(['mac'], config)
 
 
 class PListWriter(xml_formatted_writer.XMLFormattedWriter):