Add net/base/filename_util.h.

net/net.gyp

Index: net/net.gyp
diff --git a/net/net.gyp b/net/net.gyp
index ca9fbd06e781e3d4a617b39594d366333b055a87..d1a83aaa69bb267aa83f8b2d915f0eb9b00e591d 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -123,14 +123,16 @@
         'base/file_stream_net_log_parameters.cc',
         'base/file_stream_net_log_parameters.h',
         'base/file_stream_whence.h',
-        'base/int128.cc',
-        'base/int128.h',
+        'base/filename_util.cc',
+        'base/filename_util.h',
         'base/hash_value.cc',
         'base/hash_value.h',
         'base/host_mapping_rules.cc',
         'base/host_mapping_rules.h',
         'base/host_port_pair.cc',
         'base/host_port_pair.h',
+        'base/int128.cc',
+        'base/int128.h',
         'base/io_buffer.cc',
         'base/io_buffer.h',
         'base/iovec.h',
@@ -1700,9 +1702,10 @@
         'base/escape_unittest.cc',
         'base/expiring_cache_unittest.cc',
         'base/file_stream_unittest.cc',
-        'base/int128_unittest.cc',
+        'base/filename_util_unittest.cc',
         'base/host_mapping_rules_unittest.cc',
         'base/host_port_pair_unittest.cc',
+        'base/int128_unittest.cc',
         'base/ip_endpoint_unittest.cc',
         'base/ip_pattern_unittest.cc',
         'base/keygen_handler_unittest.cc',
@@ -1732,17 +1735,17 @@
         'cert/jwk_serializer_unittest.cc',
         'cert/multi_log_ct_verifier_unittest.cc',
         'cert/multi_threaded_cert_verifier_unittest.cc',
-        'cert/nss_cert_database_unittest.cc',
         'cert/nss_cert_database_chromeos_unittest.cc',
+        'cert/nss_cert_database_unittest.cc',
         'cert/nss_profile_filter_chromeos_unittest.cc',
         'cert/pem_tokenizer_unittest.cc',
         'cert/signed_certificate_timestamp_unittest.cc',
         'cert/test_root_certs_unittest.cc',
-        'cert/x509_certificate_unittest.cc',
         'cert/x509_cert_types_unittest.cc',
-        'cert/x509_util_unittest.cc',
+        'cert/x509_certificate_unittest.cc',
         'cert/x509_util_nss_unittest.cc',
         'cert/x509_util_openssl_unittest.cc',
+        'cert/x509_util_unittest.cc',
         'cookies/canonical_cookie_unittest.cc',
         'cookies/cookie_constants_unittest.cc',
         'cookies/cookie_monster_unittest.cc',
@@ -1781,9 +1784,9 @@
         'dns/mapped_host_resolver_unittest.cc',
         'dns/mdns_cache_unittest.cc',
         'dns/mdns_client_unittest.cc',
-        'dns/serial_worker_unittest.cc',
         'dns/record_parsed_unittest.cc',
         'dns/record_rdata_unittest.cc',
+        'dns/serial_worker_unittest.cc',
         'dns/single_request_host_resolver_unittest.cc',
         'filter/filter_unittest.cc',
         'filter/gzip_filter_unittest.cc',