Fix FileIO and FileRef PPAPI tests to match changes in

chrome/test/ui/ppapi_uitest.cc

 // Copyright (c) 2011 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.
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/automation/tab_proxy.h"
@@ skipping 136 matching lines @@
 }
 
 TEST_F(PPAPITest, CharSet) {
   RunTest("CharSet");
 }
 
 TEST_F(PPAPITest, Var) {
   RunTest("Var");
 }
 
-// TODO(dumi): figure out why this test is flaky / crashing.
-TEST_F(PPAPITest, DISABLED_FileIO) {
+TEST_F(PPAPITest, FileIO) {
   RunTestViaHTTP("FileIO");
 }
 
-// TODO(dumi): figure out why this test is flaky / crashing.
-TEST_F(PPAPITest, DISABLED_FileRef) {
+TEST_F(PPAPITest, FileRef) {
   RunTestViaHTTP("FileRef");
 }
 
 // http://crbug.com/63239
 TEST_F(PPAPITest, DISABLED_DirectoryReader) {
   RunTestViaHTTP("DirectoryReader");
 }