[Extensions API] Remove inline enums

chrome/common/extensions/api/extension.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": "extension",
     "description": "The <code>chrome.extension</code> API has utilities that can be used by any extension page. It includes support for exchanging messages between an extension and its content scripts or between extensions, as described in detail in <a href='messaging'>Message Passing</a>.",
     "compiler_options": {
       "implemented_in": "chrome/browser/extensions/api/module/module.h"
     },
     "properties": {
       "lastError": {
         "type": "object",
         "optional": true,
         "description": "Set for the lifetime of a callback if an ansychronous extension api has resulted in an error. If no error has occured lastError will be <var>undefined</var>.",
         "properties": {
           "message": { "type": "string", "description": "Description of the error that has taken place." }
         }
       },
       "inIncognitoContext": {
         "type": "boolean",
         "optional": true,
         "description": "True for content scripts running inside incognito tabs, and for extension pages running inside an incognito process. The latter only applies to extensions with 'split' incognito_behavior."
       }
     },
+    "types": [
+      {
+        "id": "ViewType",
+        "type": "string",
+        "enum": ["tab", "notification", "popup"],
+        "description": "The type of extension view."
+      }
+    ],
     "functions": [
       {
         "name": "sendRequest",
         "nocompile": true,
         "deprecated": "Please use $(ref:runtime.sendMessage).",
         "type": "function",
         "allowAmbiguousOptionalArguments": true,
         "description": "Sends a single request to other listeners within the extension. Similar to $(ref:runtime.connect), but only sends a single request with an optional response. The $(ref:extension.onRequest) event is fired in each page of the extension.",
         "parameters": [
           {"type": "string", "name": "extensionId", "optional": true, "description": "The extension ID of the extension you want to connect to. If omitted, default is your own extension."},
@@ skipping 34 matching lines @@
         "nocompile": true,
         "type": "function",
         "description": "Returns an array of the JavaScript 'window' objects for each of the pages running inside the current extension.",
         "parameters": [
           {
             "type": "object",
             "name": "fetchProperties",
             "optional": true,
             "properties": {
               "type": {
-                "type": "string",
-                "enum": ["tab", "notification", "popup"],
+                "$ref": "ViewType",
                 "optional": true,
                 "description": "The type of view to get. If omitted, returns all views (including background pages and tabs). Valid values: 'tab', 'notification', 'popup'."
               },
               "windowId": {
                 "type": "integer",
                 "optional": true,
                 "description": "The window to restrict the search to. If omitted, returns all views."
               }
             }
           }
@@ skipping 113 matching lines @@
         "description": "Fired when a request is sent from another extension.",
         "parameters": [
           {"name": "request", "type": "any", "optional": true, "description": "The request sent by the calling script."},
           {"name": "sender", "$ref": "runtime.MessageSender" },
           {"name": "sendResponse", "type": "function", "description": "Function to call when you have a response. The argument should be any JSON-ifiable object, or undefined if there is no response." }
         ]
       }
     ]
   }
 ]