Delete deprecated synced notifications code

chrome/common/extensions/api/_permission_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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
@@ skipping 929 matching lines @@
       "5D3851BEFF680AB6D954B76678EFCCE834465C23",  // QuickOffice Dev
       "12E618C3C6E97495AAECF2AC12DEB082353241C6",  // QO component extension
       "3727DD3E564B6055387425027AD74C58784ACC15",  // Editor
       "CBCC42ABED43A4B58FE3810E62AFFA010EB0349F"   // PDF
     ]
   },
   "syncFileSystem": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   },
-  "syncedNotificationsPrivate": {
-    "channel": "dev",
-    "extension_types": ["platform_app"],
-    "whitelist": [
-      "34967F9FA3C399E1EC380B443D7331AA93AC445B"  // http://crbug.com/400436
-    ]
-  },
   "systemPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "location": "component"
   },
   "tabs": [
     {
       "channel": "stable",
       "extension_types": ["extension", "legacy_packaged_app"]
     },
@@ skipping 90 matching lines @@
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "hosted_app"],
     "whitelist": [
       "B44D08FD98F1523ED5837D78D0A606EA9D6206E5",  // Web Store
       "2653F6F6C39BC6EEBD36A09AFB92A19782FF7EB4",  // Enterprise Web Store
       "2779FA8B45841D61A37207CCFAC9CB393964FE5B"   // Login Proxy (prototype)
     ]
   }
 }