<webview>: Partially migrate loadcommit event from content to chrome

chrome/common/extensions/api/_api_features.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.
 
 // See c/c/e/features/* to understand this file, in particular feature.h,
 // simple_feature.h, and base_feature_provider.h.
 
 {
   "activityLogPrivate": {
     "dependencies": ["permission:activityLogPrivate"],
     "contexts": ["blessed_extension"]
   },
+  "adview": {
+    "dependencies": ["permission:adview"],
+    "contexts": ["blessed_extension"]
+  },
   "alarms": {
     "dependencies": ["permission:alarms"],
     "contexts": ["blessed_extension"]
   },
   "app": {
     "channel": "stable",
     "extension_types": ["hosted_app", "extension", "packaged_app"],
     "contexts": [
       "blessed_extension", "unblessed_extension", "content_script", "web_page"
     ],
@@ skipping 521 matching lines @@
   },
   "webview": {
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["permission:tabs"],
     "contexts": ["blessed_extension"]
   }
 }