Update from chromium https://crrev.com/304586

net/base/net_util.h

 // 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.
 
 #ifndef NET_BASE_NET_UTIL_H_
 #define NET_BASE_NET_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 230 matching lines @@
                                                 bool is_dir, int64 size,
                                                 base::Time modified);
 
 // If text starts with "www." it is removed, otherwise text is returned
 // unmodified.
 NET_EXPORT base::string16 StripWWW(const base::string16& text);
 
 // Runs |url|'s host through StripWWW().  |url| must be valid.
 NET_EXPORT base::string16 StripWWWFromHost(const GURL& url);
 
+// Checks if |port| is in the valid range (0 to 65535, though 0 is technically
+// reserved).  Should be used before casting a port to a uint16.
+NET_EXPORT bool IsPortValid(int port);
+
 // Checks |port| against a list of ports which are restricted by default.
 // Returns true if |port| is allowed, false if it is restricted.
 NET_EXPORT bool IsPortAllowedByDefault(int port);
 
 // Checks |port| against a list of ports which are restricted by the FTP
 // protocol.  Returns true if |port| is allowed, false if it is restricted.
 NET_EXPORT_PRIVATE bool IsPortAllowedByFtp(int port);
 
 // Check if banned |port| has been overriden by an entry in
 // |explicitly_allowed_ports_|.
@@ skipping 311 matching lines @@
   DSCP_CS5  = 40,  // Video
   DSCP_EF   = 46,  // Voice
   DSCP_CS6  = 48,  // Voice
   DSCP_CS7  = 56,  // Control messages
   DSCP_LAST = DSCP_CS7
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_