Remove effective_manufacturer frome printer policy object.

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 9329 matching lines @@
             'display_name': { 'type': 'string' },
             'description': { 'type': 'string' },
             'manufacturer': { 'type': 'string' },
             'model': { 'type': 'string' },
             'uri': { 'type': 'string' },
             'uuid': { 'type': 'string' },
             'ppd_resource': {
               'type': 'object',
               'id': 'PpdResource',
               'properties': {
-                'effective_manufacturer': { 'type': 'string' },
                 'effective_model': { 'type': 'string' }
               }
             }
           }
         }
       },
-      'supported_on': [ 'chrome_os:56-' ],
+      'supported_on': [ 'chrome_os:57-' ],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'example_value': [{
         "display_name": "Color Laser",
         "description": "The printer next to the water cooler.",
         "manufacturer": "Printer Manufacturer",
         "model": "Color Laser 2004",
         "uri": "ipps://print-server.intranet.example.com:443/ipp/cl2k4",
         "uuid": "1c395fdb-5d93-4904-b246-b2c046e79d12",
         "ppd_resource": {
-          "effective_manufacturer": "MakesPrinters",
-          "effective_model": "ColorLaser2k4"
+          "effective_model": "Printer Manufacturer ColorLaser2k4"
         }
       }],
       'id': 350,
       'caption': '''Native Printing''',
       'tags': [],
       'desc': '''Configures a list of printers.
 
       This policy allows administrators to provide printer configurations for
       their users.
 
       <ph name="PRINTER_DISPLAY_NAME">display_name</ph> and <ph
       name="PRINTER_DESCRIPTION">description</ph> are free form strings that
       can be customized for ease of printer selection. <ph
       name="PRINTER_MANUFACTURER">manufacturer</ph> and <ph
-      name="PRINTER_MODEL">model</ph> should match one of the <ph
-      name="PRODUCT_NAME">$2<ex>Google Chrome OS</ex></ph> supported
-      printers.  <ph name="PRINTER_URI">uri</ph> should be an address reachable
+      name="PRINTER_MODEL">model</ph> serve to ease printer identification by
+      end users. They represent the manufcaturer and model of the printer. <ph
+      name="PRINTER_URI">uri</ph> should be an address reachable
       from a client computer including the <ph name="URI_SCHEME">scheme</ph>,
       <ph name="URI_PORT">port</ph>, and <ph name="URI_QUEUE">queue</ph>.  <ph
       name="PRINTER_UUID">uuid</ph> is optional.  If provided, it is used to
       help deduplicate <ph name="ZEROCONF_DISCOVERY">zeroconf</ph> printers.
 
+      <ph name="PRINTER_EFFECTIVE_MODEL">effective_model</ph> must match one of
+      the strings which represent a <ph name="PRODUCT_NAME">$2<ex>Google Chrome
+      OS</ex></ph> supported printer. The string will be used to identify and
+      install the appropriate PPD for the printer. More information can be
+      found at https://support.google.com/chrome?p=noncloudprint.
+
       Printer setup is completed upon the first use of a printer.  PPDs are not
       downloaded until the printer is used.  After that time, frequently used
       PPDs are cached.
 
       This policy has no effect on whether users can configure printers on
       individual devices.  It is intended to be supplementary to the
       configuration of printers by individual users.''',
     },
     {
       'name': 'QuickUnlock',
@@ skipping 338 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': [],
 }