Restore FSP API's read tests.

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc

 // Copyright 2013 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 <memory>
 #include <utility>
 
 #include "base/files/file.h"
 #include "base/macros.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 141 matching lines @@
                                           kFlagLoadAsComponent))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, ReadDirectory) {
   ASSERT_TRUE(RunPlatformAppTestWithFlags("file_system_provider/read_directory",
                                           kFlagLoadAsComponent))
       << message_;
 }
 
-// http://crbug.com/691449
-#if defined(OS_CHROMEOS)
-#define MAYBE_ReadFile DISABLED_ReadFile
-#else
-#define MAYBE_ReadFile ReadFile
-#endif
-IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, MAYBE_ReadFile) {
+IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, ReadFile) {
   ASSERT_TRUE(RunPlatformAppTestWithFlags("file_system_provider/read_file",
                                           kFlagLoadAsComponent))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, BigFile) {
   ASSERT_TRUE(RunPlatformAppTestWithFlags("file_system_provider/big_file",
                                           kFlagLoadAsComponent))
       << message_;
 }
@@ skipping 107 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, Unresponsive_App) {
   AbortOnUnresponsivePerformer performer(browser()->profile());
   ASSERT_TRUE(RunPlatformAppTestWithFlags(
       "file_system_provider/unresponsive_app", kFlagLoadAsComponent))
       << message_;
 }
 
 }  // namespace extensions