Update from chromium https://crrev.com/302282

net/disk_cache/entry_unittest.cc

 // 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.
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/platform_thread.h"
-#include "base/timer/timer.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/blockfile/backend_impl.h"
 #include "net/disk_cache/blockfile/entry_impl.h"
 #include "net/disk_cache/disk_cache_test_base.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "net/disk_cache/memory/mem_entry_impl.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
@@ skipping 2300 matching lines @@
   memset(store->key + key.size(), 'k', sizeof(store->key) - key.size());
   entry_impl->entry()->set_modified();
   entry->Close();
 
   // We have a corrupt entry. Now reload it. We should NOT read beyond the
   // allocated buffer here.
   ASSERT_NE(net::OK, OpenEntry(key, &entry));
   DisableIntegrityCheck();
 }
 
-// The Simple Cache backend requires a few guarantees from the filesystem like
-// atomic renaming of recently open files. Those guarantees are not provided in
-// general on Windows.
-#if defined(OS_POSIX)
-
 TEST_F(DiskCacheEntryTest, SimpleCacheInternalAsyncIO) {
   SetSimpleCacheMode();
   InitCache();
   InternalAsyncIO();
 }
 
 TEST_F(DiskCacheEntryTest, SimpleCacheExternalAsyncIO) {
   SetSimpleCacheMode();
   InitCache();
   ExternalAsyncIO();
@@ skipping 1707 matching lines @@
 
   ret = entry->ReadSparseData(kSize, buffer.get(), kSize, callback.callback());
   EXPECT_EQ(kSize, callback.GetResult(ret));
 
   // Make sure the first range was removed when the second was written.
   ret = entry->ReadSparseData(0, buffer.get(), kSize, callback.callback());
   EXPECT_EQ(0, callback.GetResult(ret));
 
   entry->Close();
 }
-
-#endif  // defined(OS_POSIX)