Factor out SameHost() in registry_controlled_domains

net/base/registry_controlled_domains/registry_controlled_domain.cc

Index: net/base/registry_controlled_domains/registry_controlled_domain.cc
diff --git a/net/base/registry_controlled_domains/registry_controlled_domain.cc b/net/base/registry_controlled_domains/registry_controlled_domain.cc
index ca367f7214297509d21ea2f3e0bb8284e2ef855a..48e95508664313e955fbd585c6d673b07d47f119 100644
--- a/net/base/registry_controlled_domains/registry_controlled_domain.cc
+++ b/net/base/registry_controlled_domains/registry_controlled_domain.cc
@@ -202,6 +202,16 @@ std::string GetDomainAndRegistry(base::StringPiece host,
   return GetDomainAndRegistryImpl(canon_host, filter).as_string();
 }
 
+bool SameHost(const GURL& gurl1, const GURL& gurl2) {
+  const url::Component host1 = gurl1.parsed_for_possibly_invalid_spec().host;
+  const url::Component host2 = gurl2.parsed_for_possibly_invalid_spec().host;
+  if ((host1.len <= 0) || (host1.len != host2.len))
+    return false;
+  return !strncmp(gurl1.possibly_invalid_spec().data() + host1.begin,
+                  gurl2.possibly_invalid_spec().data() + host2.begin,
+                  host1.len);
+}
+
 bool SameDomainOrHost(
     const GURL& gurl1,
     const GURL& gurl2,
@@ -216,13 +226,7 @@ bool SameDomainOrHost(
     return domain1 == domain2;
 
   // No domains.  See if the hosts are identical.
-  const url::Component host1 = gurl1.parsed_for_possibly_invalid_spec().host;
-  const url::Component host2 = gurl2.parsed_for_possibly_invalid_spec().host;
-  if ((host1.len <= 0) || (host1.len != host2.len))
-    return false;
-  return !strncmp(gurl1.possibly_invalid_spec().data() + host1.begin,
-                  gurl2.possibly_invalid_spec().data() + host2.begin,
-                  host1.len);
+  return SameHost(gurl1, gurl2);
 }
 
 bool SameDomainOrHost(const url::Origin& origin1,