Use SpecRunnerUtils.deletePath() instead of removeTempDirectory

Author: jasonsanjose

test/spec/ExtensionInstallation-test.js

@@ -132,7 +132,7 @@ define(function (require, exports, module) {
         afterEach(function () {
             ExtensionLoader.getUserExtensionPath = realGetUserExtensionPath;
             ExtensionLoader.loadExtension = realLoadExtension;
-            var promise = SpecRunnerUtils.removeTempDirectory();
+            var promise = SpecRunnerUtils.deletePath(mockGetUserExtensionPath(), true);
             waitsForDone(promise, "Mock Extension Removal", 2000);
         });