Fix supported_on versions for retired policies.

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 e03c30a4cc83c5e3406993dff08b9d3fcc0f244b..68f8bece4873a0f0f01a3d277716c59f9f46745b 100644
--- a/chrome/app/policy/policy_templates.json
+++ b/chrome/app/policy/policy_templates.json
@@ -995,7 +995,7 @@
       'name': 'ClearSiteDataOnExit',
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'supported_on': ['chrome.*:11-29', 'chrome_os:0.11-0.29'],
+      'supported_on': ['chrome.*:11-28', 'chrome_os:0.11-0.28'],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': True,
@@ -3005,7 +3005,7 @@
       'name': 'EnterpriseWebStoreURL',
       'type': 'string',
       'schema': { 'type': 'string' },
-      'supported_on': ['chrome.*:17-29', 'chrome_os:0.17-0.29'],
+      'supported_on': ['chrome.*:17-28', 'chrome_os:0.17-0.28'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
@@ -3020,7 +3020,7 @@
       'name': 'EnterpriseWebStoreName',
       'type': 'string',
       'schema': { 'type': 'string' },
-      'supported_on': ['chrome.*:17-29', 'chrome_os:0.17-0.29'],
+      'supported_on': ['chrome.*:17-28', 'chrome_os:0.17-0.28'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,