Implement InstanceID API functions.

chrome/test/data/extensions/api_test/instance_id/incognito/test.js

Index: chrome/test/data/extensions/api_test/instance_id/incognito/test.js
diff --git a/chrome/test/data/extensions/api_test/gcm/functions/incognito/test.js b/chrome/test/data/extensions/api_test/instance_id/incognito/test.js
similarity index 72%
copy from chrome/test/data/extensions/api_test/gcm/functions/incognito/test.js
copy to chrome/test/data/extensions/api_test/instance_id/incognito/test.js
index 8184b38c9303a2a7c02cc4172e69e8ebcedaca1d..5d50bdccd440460850d9aded0966b256cc88a074 100644
--- a/chrome/test/data/extensions/api_test/gcm/functions/incognito/test.js
+++ b/chrome/test/data/extensions/api_test/instance_id/incognito/test.js
@@ -1,10 +1,10 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2015 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.
 
 chrome.test.runTests([
   function testIncognito() {
-    chrome.gcm.register(["Sender"], function(registrationId) {
+    chrome.instanceID.getID(function(id) {
       chrome.test.assertEq(chrome.runtime.lastError != undefined,
                            chrome.extension.inIncognitoContext);
       chrome.test.succeed();