Deflake Simple Cache backend on Windows.

net/disk_cache/entry_unittest.cc

Index: net/disk_cache/entry_unittest.cc
diff --git a/net/disk_cache/entry_unittest.cc b/net/disk_cache/entry_unittest.cc
index 60811370a207e46487599644791c0da39a7ac870..826b44f825da0bdf1519a0a7262d8f8867f1168a 100644
--- a/net/disk_cache/entry_unittest.cc
+++ b/net/disk_cache/entry_unittest.cc
@@ -2331,11 +2331,6 @@ TEST_F(DiskCacheEntryTest, KeySanityCheck) {
   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();
@@ -4063,5 +4058,3 @@ TEST_F(DiskCacheEntryTest, SimpleCacheTruncateLargeSparseFile) {
 
   entry->Close();
 }
-
-#endif  // defined(OS_POSIX)