Fix closing namespace comments in //net.

net/disk_cache/simple/simple_test_util.h

Index: net/disk_cache/simple/simple_test_util.h
diff --git a/net/disk_cache/simple/simple_test_util.h b/net/disk_cache/simple/simple_test_util.h
index fa119cdffef5cf274d5770d9e80c04d01ed5fda3..79a6468162db176991234cacf93a2d49a509df06 100644
--- a/net/disk_cache/simple/simple_test_util.h
+++ b/net/disk_cache/simple/simple_test_util.h
@@ -55,7 +55,7 @@ bool CorruptKeySHA256FromEntry(const std::string& key,
 bool CorruptStream0LengthFromEntry(const std::string& key,
                                    const base::FilePath& cache_path);
 
-}  // namespace simple_backend
+}  // namespace simple_util
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_TEST_UTIL_H_