Syntax checker for policy_templates.json

chrome/app/policy/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 63 matching lines @@
 #     'chrome.win', 'chrome.linux', 'chrome.mac', 'chrome.*'
 #   For example if 'chrome.*:5-10' is specified for a policy, then it should
 #   be read as:
 #     'chrome.linux:5-10,chrome.mac:5-10,chrome.win:5-10'
 #   The product name also affects in which templates will the policy be included.
 #     chrome.*, chrome.win, chrome_frame -> ADM,ADMX,ADML,doc
 #     chrome.*, chrome.linux -> JSON,doc
 #     chrome.*, chrome.mac -> plist, plist_strings,doc
 #     everything else -> doc
 #
-# Annotations: 
+# Annotations:
 #   Additional information is specified under keys 'features' and
 #   'example_value'. These are used in the generated documentation and example
 #   policy configuration files.
 #
   'policy_definitions': [
     {
       'name': 'Homepage',
       'type': 'group',
       'caption': '''Home page''',
       'desc': '''Configure the default home page in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> and prevents users from changing it.
@@ skipping 1051 matching lines @@
     {
       'key': '$4',
       'value': 'http://www.chromium.org/developers/how-tos/chrome-frame-getting-started'
     },
     {
       'key': '$5',
       'value': 'http://www.chromium.org/administrators/policy-templates'
     },
   ]
 }