Support domain=IPADDR if it matches the url ip address exactly.

net/base/cookie_monster.cc

Index: net/base/cookie_monster.cc
diff --git a/net/base/cookie_monster.cc b/net/base/cookie_monster.cc
index 6d9afcb0330de0fddfa872f38980907049c635fc..288ea0f4c0d2c94a551395e31744348f88183b4b 100644
--- a/net/base/cookie_monster.cc
+++ b/net/base/cookie_monster.cc
@@ -259,8 +259,12 @@ static bool GetCookieDomainKey(const GURL& url,
                                const CookieMonster::ParsedCookie& pc,
                                std::string* cookie_domain_key) {
   const std::string url_host(url.host());
-  if (!pc.HasDomain() || pc.Domain().empty()) {
-    // No domain was specified in cookie -- default to host cookie.
+
+  // If no domain was specified in the cookie, default to a host cookie.
+  // We match IE/Firefox in allowing a domain=IPADDR if it matches the url
+  // ip address hostname exactly.  It should be treated as a host cookie.
+  if (!pc.HasDomain() || pc.Domain().empty() ||
+      (url.HostIsIPAddress() && url_host == pc.Domain())) {
     *cookie_domain_key = url_host;
     DCHECK((*cookie_domain_key)[0] != '.');
     return true;