Move DNS functions from net_error_info.h into error_page namespace.

chrome/renderer/net/net_error_helper.cc

Index: chrome/renderer/net/net_error_helper.cc
diff --git a/chrome/renderer/net/net_error_helper.cc b/chrome/renderer/net/net_error_helper.cc
index 8e61177230af387825eec7e6754f5884255aedaa..4009b8c950847bb72e1c26a93895cb65ffac2bf0 100644
--- a/chrome/renderer/net/net_error_helper.cc
+++ b/chrome/renderer/net/net_error_helper.cc
@@ -42,12 +42,12 @@
 
 using base::JSONWriter;
 using chrome_common_net::DnsProbeStatus;
-using chrome_common_net::DnsProbeStatusToString;
 using content::DocumentState;
+using content::kUnreachableWebDataURL;
 using content::RenderFrame;
 using content::RenderFrameObserver;
 using content::RenderThread;
-using content::kUnreachableWebDataURL;
+using error_page::DnsProbeStatusToString;
 using error_page::ErrorPageParams;
 using error_page::NetErrorHelperCore;