Add "regular_only" scope to allowed scopes for ChromeSetting.clear().

chrome/common/extensions/api/types.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "types",
     "types": [
       {
         "id": "ChromeSetting",
@@ skipping 83 matching lines @@
             "type": "function",
             "description": "Clears the setting. This way default settings can become effective again.",
             "parameters": [
               {
                 "name": "details",
                 "type": "object",
                 "description": "What setting to clear.",
                 "properties": {
                   "scope": {
                     "type": "string",
-                    "enum": ["regular", "incognito_persistent", "incognito_session_only"],
+                    "enum": ["regular", "regular_only", "incognito_persistent", "incognito_session_only"],
                     "optional": true,
                     "description": "Where to clear the setting (default: regular). One of<br><var>regular</var>: setting for the regular profile (which is inherited by the incognito profile if not overridden elsewhere),<br><var>regular_only</var>: setting for the regular profile only (not inherited by the incognito profile),<br><var>incognito_persistent</var>: setting for the incognito profile that survives browser restarts (overrides regular preferences),<br><var>incognito_session_only</var>: setting for the incognito profile that can only be set during an incognito session and is deleted when the incognito session ends (overrides regular and incognito_persistent preferences)."
                   }
                 }
               },
               {
                 "name": "callback",
                 "type": "function",
                 "description": "Called after the setting has been cleared.",
                 "optional": true,
@@ skipping 27 matching lines @@
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]