Removed --disable-print-preview switch and policy.

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 3673 matching lines @@
       'desc': '''This policy has been retired as of <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> version 35.
 
       Memory info is anyway reported to page, regardless of the option value, but the sizes reported are
       quantized and the rate of updates is limited for security reasons. To obtain real-time precise data,
       please use tools like Telemetry.''',
     },
     {
       'name': 'DisablePrintPreview',
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'supported_on': ['chrome.*:18-'],
+      'supported_on': ['chrome.*:18-38'],
+      'deprecated': True,

[bartfab (slow), 2014/08/21 09:09:43]

Please add a line to the policy description that states this policy is
deprecated and will no longer be honored as of M39.

[Vitaly Buka (NO REVIEWS), 2014/08/21 09:57:41]

Done.

       'features': {
         'dynamic_refresh': False,
         'per_profile': True,
       },
       'example_value': False,
       'id': 117,
       'caption': '''Disable Print Preview''',
       'desc': '''Show the system print dialog instead of print preview.
 
       When this setting is enabled, <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will open the system print dialog instead of the built-in print preview when a user requests a page to be printed.
@@ skipping 3063 matching lines @@
       'desc': '''Text appended in parentheses to the policy name to indicate that it has been deprecated''',
       'text': 'deprecated',
     },
     'doc_recommended': {
       '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)',
     },
   },
   'placeholders': [],
 }