[Extensions API] Remove inline enums

chrome/common/extensions/api/history.json

Index: chrome/common/extensions/api/history.json
diff --git a/chrome/common/extensions/api/history.json b/chrome/common/extensions/api/history.json
index c4e11cc83859a672ba2352dbe5ac5996866ae7f4..946888ebaee81f8457a8ecff2fcf5fcdc5524837 100644
--- a/chrome/common/extensions/api/history.json
+++ b/chrome/common/extensions/api/history.json
@@ -8,6 +8,12 @@
     "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.",
@@ -30,8 +36,7 @@
           "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."
           }
         }