Update some callers to use more direct ways of constructing IPAddress from well known literals.

net/base/ip_address.cc

 // Copyright (c) 2015 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 "net/base/ip_address.h"
 
 #include "net/base/ip_address_number.h"
 #include "url/gurl.h"
 #include "url/url_canon_ip.h"
 
@@ skipping 71 matching lines @@
   static const uint8_t kLocalhostIPv6[] = {0, 0, 0, 0, 0, 0, 0, 0,
                                            0, 0, 0, 0, 0, 0, 0, 1};
   return IPAddress(kLocalhostIPv6);
 }
 
 // static
 IPAddress IPAddress::AllZeros(size_t num_zero_bytes) {
   return IPAddress(std::vector<uint8_t>(num_zero_bytes));
 }
 
+// static
+IPAddress IPAddress::IPv4AllZeros() {
+  return AllZeros(kIPv4AddressSize);
+}
+
+// static
+IPAddress IPAddress::IPv6AllZeros() {
+  return AllZeros(kIPv6AddressSize);
+}
+
 bool IPAddress::operator==(const IPAddress& that) const {
   return ip_address_ == that.ip_address_;
 }
 
 bool IPAddress::operator!=(const IPAddress& that) const {
   return ip_address_ != that.ip_address_;
 }
 
 bool IPAddress::operator<(const IPAddress& that) const {
   // Sort IPv4 before IPv6.
@@ skipping 29 matching lines @@
 
 unsigned CommonPrefixLength(const IPAddress& a1, const IPAddress& a2) {
   return CommonPrefixLength(a1.bytes(), a2.bytes());
 }
 
 unsigned MaskPrefixLength(const IPAddress& mask) {
   return MaskPrefixLength(mask.bytes());
 }
 
 }  // namespace net