[Chrome OS ECHO]: Rename API and method names

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.
 
 {
   "appNotifications": {
     "channel": "stable",
     "extension_types": ["packaged_app", "hosted_app"]
   },
   "background": {
@@ skipping 132 matching lines @@
     "channel": "stable",
     "extension_types": ["extension", "packaged_app", "platform_app"],
     "location": "component"
   },
   "notifications": {
     "channel": "stable",
     "extension_types": [
       "extension", "packaged_app", "hosted_app", "platform_app"
     ]
   },
-  "offersPrivate": {
+  "echoPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app", "platform_app"],
     "location": "component"
   },
   "pageCapture": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "plugin": {
     "channel": "stable",
@@ skipping 80 matching lines @@
   },
   "webRequest": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   }
 }