[Extensions] Convert APIs to use movable types [7]

chrome/common/extensions/api/metrics_private.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": "metricsPrivate",
     "description": "none",
+    "compiler_options": {"use_movable_types": true},
     "types": [
       {
         "id": "MetricTypeType",
         "type": "string",
         "enum": ["histogram-log", "histogram-linear"],
         "description": "The type of metric, such as 'histogram-log' or 'histogram-linear'."
       },
       {
         "id": "MetricType",
         "type":  "object",
@@ skipping 148 matching lines @@
         "description": "Adds a value to the given metric.",
         "parameters": [
           {"name": "metric", "$ref": "MetricType"},
           {"name": "value", "type": "integer"}
         ]
       }
     ],
     "events": []
   }
 ]