Remove chrome.webstorePrivate.silentlyInstall.

chrome/test/data/extensions/api_test/webstore_private/silently_install.html

-<!--
- * 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.
--->
-<script src="common.js"></script>
-<script>
-
-var extension1 = {
-  'id': 'bmfoocgfinpmkmlbjhcbofejhkhlbchk',
-  'manifest': getManifest('bundle/extension1.json')
-};
-
-var extension2 = {
-  'id': 'mpneghmdnmaolkljkipbhaienajcflfe',
-  'manifest': getManifest('bundle/extension2.json')
-};
-
-var extension3 = {
-  'id': 'begfmnajjkbjdgmffnjaojchoncnmngg',
-  'manifest': getManifest('bundle/app2.json')
-};
-
-runTests([
-  function invalidID() {
-    var expectedError = "Invalid id";
-    chrome.webstorePrivate.silentlyInstall(
-        { 'id': 'dladmdjkfniedhfhcfoefgojhgaiaccc', 'manifest': getManifest() },
-        callbackFail(expectedError));
-  },
-
-  function successfulInstall() {
-    chrome.webstorePrivate.silentlyInstall(extension1, callbackPass(function() {
-      checkItemInstalled(
-          extension1.id,
-          callbackPass(function(result) { assertTrue(result); }));
-    }));
-
-    chrome.webstorePrivate.silentlyInstall(extension2, callbackPass(function() {
-      checkItemInstalled(
-           extension2.id,
-           callbackPass(function(result) { assertTrue(result); }));
-      chrome.webstorePrivate.silentlyInstall(
-          extension3, callbackPass(function() {
-        checkItemInstalled(
-             extension3.id,
-             callbackPass(function(result) { assertTrue(result); }));
-      }));
-    }));
-  }
-]);
-
-</script>