Retire ClearSiteDataOnExit policy.

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 977 matching lines @@
 
       See http://www.chromium.org/administrators/policy-list-3/user-data-directory-variables for a list of variables that can be used.
 
       If this policy is left not set the default download directory will be used and the user will be able to change it.''',
       'label': '''Set download directory''',
     },
     {
       'name': 'ClearSiteDataOnExit',
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'supported_on': ['chrome.*:11-', 'chrome_os:0.11-'],
+      'supported_on': ['chrome.*:11-29', 'chrome_os:0.11-0.29'],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'deprecated': True,
       'example_value': True,
       'id': 65,
       'caption': '''Clear site data on browser shutdown (deprecated)''',
-      'desc': '''This policy is an override for the "Clear cookies and other site data when I close my browser" content settings option that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> supported prior to version 21.
-
-      This policy exists only for backward-compatibility and will go away in the future. The recommended way to clear site data on exit on version 21 and later is to configure the DefaultCookiesSetting policy to session-only.
-
-      If this policy is enabled it will be translated to the appropriate policy setting for the DefaultCookiesSetting policy, setting it to session-only if the DefaultCookiesSetting policy is not configured or set to Allow.
-
-      If this policy is disabled or left unconfigured the policy for storing site data is determined by the DefaultCookiesSetting policy.''',
+      'desc': '''This policy has been retired as of <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> version 29.''',
       'label': '''Clear site data on browser shutdown (deprecated)''',
     },
     {
       'name': 'Proxy',
       'type': 'group',
       'caption': '''Proxy server''',
       'desc': '''Allows you to specify the proxy server used by <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> and prevents users from changing proxy settings.
 
       If you choose to never use a proxy server and always connect directly, all other options are ignored.
 
@@ skipping 3787 matching lines @@
       'desc': '''Text appended in parentheses to the policy name to indicate that it has been deprecated''',
       'text': 'deprecated',
     },
     'doc_recommended': {
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
   },
   'placeholders': [],
 }