Implement pref policy for disabling incognito mode....

chrome/app/policy/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 188 matching lines @@
       'features': {'dynamic_refresh': 0},
       'example_value': True,
       'caption': '''Enable JavaScript''',
       'desc': '''Enables JavaScript in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> and prevents users from changing this setting.
 
       If this setting is enabled or not configured, web pages can use JavaScript.
 
       If this setting is disabled, web pages cannot use JavaScript.''',
     },
     {
+      'name': 'IncognitoEnabled',
+      'type': 'main',
+      'supported_on': ['chrome.*:11-'],
+      'features': {'dynamic_refresh': 1},
+      'example_value': False,
+      'caption': '''Enable Incognito mode''',
+      'desc': '''Enables Incognito mode in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
+
+      If this setting is enabled or not configured, users can open web pages in incognito mode.
+
+      If this setting is disabled, users cannot open web pages in incognito mode.''',
+    },
+    {
       'name': 'SavingBrowserHistoryDisabled',
       'type': 'main',
       'supported_on': ['chrome.*:8-'],
       'features': {'dynamic_refresh': 1},
       'example_value': True,
       'caption': '''Disable saving browser history''',
       '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.
 
@@ skipping 937 matching lines @@
     {
       'key': '$4',
       'value': 'http://www.chromium.org/developers/how-tos/chrome-frame-getting-started'
     },
     {
       'key': '$5',
       'value': 'http://www.chromium.org/administrators/policy-templates'
     },
   ]
 }