CDM FileIOTest: Work around flakiness by not closing during read/write.

chrome/browser/media/encrypted_media_browsertest.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 "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/media/media_browsertest.h"
@@ skipping 619 matching lines @@
 
 // Testing that the media browser test does fail on plugin crash.
 // crbug.com/386657
 IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, DISABLED_CDMExpectedCrash) {
   // Plugin crash is not ignored by default, the test is expected to fail.
   EXPECT_NONFATAL_FAILURE(
       TestNonPlaybackCases(kExternalClearKeyCrashKeySystem, kError),
       "plugin crash");
 }
 
-// Disabled on Windows because this flakily causes failures in ~File, which
-// causes base::ThreadRestrictions::AssertIOAllowed problems. crbug.com/415742
-#if defined(OS_WIN)
-#define MAYBE_FileIOTest DISABLED_FileIOTest
-#else
-#define MAYBE_FileIOTest FileIOTest
-#endif
-IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, MAYBE_FileIOTest) {
+IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, FileIOTest) {
   TestNonPlaybackCases(kExternalClearKeyFileIOTestKeySystem,
                        kFileIOTestSuccess);
 }
 
 IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, LoadLoadableSession) {
   RunEncryptedMediaTest(kDefaultEmePlayer,
                         "bear-320x240-v_enc-v.webm",
                         kWebMVideoOnly,
                         kExternalClearKeyKeySystem,
                         SRC,
                         PREFIXED,
                         kLoadableSession,
                         false,
                         kEnded);
 }
 
 IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, LoadUnknownSession) {
   // TODO(xhwang): Add a specific error for this failure, e.g. kSessionNotFound.
   RunEncryptedMediaTest(kDefaultEmePlayer,
                         "bear-320x240-v_enc-v.webm",
                         kWebMVideoOnly,
                         kExternalClearKeyKeySystem,
                         SRC,
                         PREFIXED,
                         kUnknownSession,
                         false,
                         kEmeKeyError);
 }
 #endif  // defined(ENABLE_PEPPER_CDMS)