[Extensions API] Remove inline enums

chrome/common/extensions/api/history.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": "history",
     "description": "Use the <code>chrome.history</code> API to interact with the browser's record of visited pages. You can add, remove, and query for URLs in the browser's history. To override the history page with your own version, see <a href='override'>Override Pages</a>.",
     "types": [
       {
+        "id": "TransitionType",
+        "type": "string",
+        "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "auto_toplevel", "form_submit", "reload", "keyword", "keyword_generated"],
+        "description": "The <a href='#transition_types'>transition type</a> for this visit from its referrer."
+      },
+      {
         "id": "HistoryItem",
         "type": "object",
         "description": "An object encapsulating one result of a history query.",
         "properties": {
           "id": {"type": "string", "minimum": 0, "description": "The unique identifier for the item."},
           "url": {"type": "string", "optional": true, "description": "The URL navigated to by a user."},
           "title": {"type": "string", "optional": true, "description": "The title of the page when it was last loaded."},
           "lastVisitTime": {"type": "number", "optional": true, "description": "When this page was last loaded, represented in milliseconds since the epoch."},
           "visitCount": {"type": "integer", "optional": true, "description": "The number of times the user has navigated to this page."},
           "typedCount": {"type": "integer", "optional": true, "description": "The number of times the user has navigated to this page by typing in the address."}
         }
       },
       {
         "id": "VisitItem",
         "type": "object",
         "description": "An object encapsulating one visit to a URL.",
         "properties": {
           "id": {"type": "string", "minimum": 0, "description": "The unique identifier for the item."},
           "visitId": {"type": "string", "description": "The unique identifier for this visit."},
           "visitTime": {"type": "number", "optional": true, "description": "When this visit occurred, represented in milliseconds since the epoch."},
           "referringVisitId": {"type": "string", "description": "The visit ID of the referrer."},
           "transition": {
-            "type": "string",
-            "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "auto_toplevel", "form_submit", "reload", "keyword", "keyword_generated"],
+            "$ref": "TransitionType",
             "description": "The <a href='#transition_types'>transition type</a> for this visit from its referrer."
           }
         }
       }
     ],
     "functions": [
       {
         "name": "search",
         "type": "function",
         "description": "Searches the history for the last visit time of each page matching the query.",
@@ skipping 127 matching lines @@
             "properties": {
               "allHistory": { "type": "boolean", "description": "True if all history was removed.  If true, then urls will be empty." },
               "urls": { "type": "array", "items": { "type": "string" }, "optional": true}
             }
           }
         ]
       }
     ]
   }
 ]