Implemented a policy to match the ClearSiteDataOnExit pref.

chrome/app/policy/policy_templates.json

Index: chrome/app/policy/policy_templates.json
diff --git a/chrome/app/policy/policy_templates.json b/chrome/app/policy/policy_templates.json
index f699171b6a6aa781ab0faee95f4955d1d3ccee0a..691b2ba5979db3ed9152f6f8585d416d158fa6dd 100644
--- a/chrome/app/policy/policy_templates.json
+++ b/chrome/app/policy/policy_templates.json
@@ -91,7 +91,7 @@
 #   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': [
     {
@@ -432,6 +432,19 @@
       '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': '''This policy is an override for the "Clear cookies and other site data when I close my browser" content settings option.
+
+      When set to true <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will delete all locally stored data from the browser when it is shut down.''',
+      'label': '''Clear site date on browser shutdown''',
+    },
+    {
       'name': 'Proxy',
       'type': 'group',
       'caption': '''Proxy server''',