ChromeOS: enable SystemTimezoneAutomaticDetectionPolicy by default.

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 8414 matching lines @@
           'name': 'TimezoneAutomaticDetectionIPOnly',
           'value': 2,
           'caption': '''Always use coarse timezone detection.''',
         },
         {
           'name': 'TimezoneAutomaticDetectionSendWiFiAccessPoints',
           'value': 3,
           'caption': '''Always send WiFi acess-points to server while resolving timezone.''',
         },
       ],
-      'supported_on': ['chrome_os:51-'],
+      'supported_on': ['chrome_os:53-'],
       'device_only': True,
       'features': {
         'dynamic_refresh': True,
       },
       'example_value': 0,
       'id': 326,
       'caption': '''Configure the automatic timezone detection method''',
       'tags': ['google-sharing'],
       'desc': '''When this policy is set, automatic timezone detection flow will be in one of the following ways depending on the value of the setting:
 
@@ skipping 256 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': [],
 }