Define a new policy to disable clearing the browsing history from the UI.

components/policy/resources/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 635 matching lines @@
       'caption': '''Disable saving browser history''',
       'tags': [],
       'desc': '''Disables saving browser history in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> and prevents users from changing this setting.
 
       If this setting is enabled, browsing history is not saved. This setting also disables tab syncing.
 
       If this setting is disabled or not set, browsing history is saved.''',
     },
     {
       'name': 'AllowDeletingBrowserHistory',
-      'future': True,
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      # TODO(pamg): Restore the correct 'supported' line when the UI properly
-      # shows that deleting browser history is disabled. Also fix the 'os' line
-      # in policy_test_cases.json.
-      # 'supported_on': ['chrome.*:27-', 'chrome_os:27-'],
-      'supported_on': [],
+      'supported_on': ['chrome.*:57-', 'chrome_os:57-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'example_value': True,
       'id': 187,
       'caption': '''Enable deleting browser and download history''',
-      'tags': [],
+      'tags': ['local-data-access', 'admin-sharing'],
       'desc': '''Enables deleting browser history and download history in <ph name="PRODUCT_NAME">$<ex>Google Chrome</ex></ph> and prevents users from changing this setting.
 
       Note that even with this policy disabled, the browsing and download history are not guaranteed to be retained: users may be able to edit or delete the history database files directly, and the browser itself may expire or archive any or all history items at any time.
 
       If this setting is enabled or not set, browsing and download history can be deleted.
 
       If this setting is disabled, browsing and download history cannot be deleted.''',
     },
     {
       'name': 'AllowDinosaurEasterEgg',
@@ skipping 8815 matching lines @@
       '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)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }