Implemented a policy to match the ClearSiteDataOnExit pref.

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 73 matching lines @@
 # Annotations:
 #   Additional information is specified under keys 'features' and
 #   'example_value'. These are used in the generated documentation and example
 #   policy configuration files.
 #
 # IDs:
 #   Since a Protocol Buffer definition is generated from this file, unique and
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 64
+#   For your editing convenience: highest ID currently used: 65
 #
   '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.
 
       The user's home page settings are only completely locked down, if you either select the home page to be the new tab page, or set it to be a URL and specify a home page URL. If you don't specify the home page URL, then the user is still able to set the home page to the new tab page by specifying 'chrome://newtab'.''',
       'policies': [
@@ skipping 320 matching lines @@
       'features': {'dynamic_refresh': 1},
       'example_value': '${user_home}\Chrome',
       'id': 64,
       'caption': '''Set download directory''',
       'desc': '''Configures the directory that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for downloading files.
 
       If you set this policy, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use the provided directory regardless whether the user has specified one or enabled the flag to be prompted for download location every time.''',
       'label': '''Set download directory''',
     },
     {
+      'name': 'ClearSiteDataOnExit',
+      'type': 'main',
+      'supported_on': ['chrome.*:11-', 'chrome_os.*:1.0.0.0-'],
+      'features': {'dynamic_refresh': 1},
+      'example_value': True,
+      'id': 65,
+      'caption': '''Clear site date on browser shutdown''',
+      'desc': '''When set <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will delete all locally stored data from the browser.''',

[Mattias Nissler (ping if slow), 2011/02/17 16:41:47]

maybe add "upon shutdown". Maybe be more specific of what data exactly gets
deleted.

+      'label': '''Clear site date on browser shutdown''',
+    },
+    {
       '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.
 
       If you choose to auto detect the proxy server, all other options are ignored.
 
       For detailed examples, visit:
@@ skipping 878 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'
     },
   ]
 }