[net/dns] Hardcode DnsConfig.timeout to 1 second.

net/dns/dns_config_service.cc

Index: net/dns/dns_config_service.cc
diff --git a/net/dns/dns_config_service.cc b/net/dns/dns_config_service.cc
index f17e32b73048a08a4ec84f2ac1c84eeb2ef1795c..2291b4ebb061d72fcc3b6021e92c9e5d20d3bfed 100644
--- a/net/dns/dns_config_service.cc
+++ b/net/dns/dns_config_service.cc
@@ -11,11 +11,12 @@
 
 namespace net {
 
-// Default values are taken from glibc resolv.h.
+// Default values are taken from glibc resolv.h except timeout which is set to
+// |kDnsTimeoutSeconds|.
 DnsConfig::DnsConfig()
     : append_to_multi_label_name(true),
       ndots(1),
-      timeout(base::TimeDelta::FromSeconds(5)),
+      timeout(base::TimeDelta::FromSeconds(kDnsTimeoutSeconds)),
       attempts(2),
       rotate(false),
       edns0(false) {}