Move DNS functions from net_error_info.h into error_page namespace.

chrome/browser/net/net_error_tab_helper.cc

Index: chrome/browser/net/net_error_tab_helper.cc
diff --git a/chrome/browser/net/net_error_tab_helper.cc b/chrome/browser/net/net_error_tab_helper.cc
index 02744df7c73585f6964c6bab8b39cb8a162c2f0d..bc71d6af6445304ca52c403050566b0b4047a9fe 100644
--- a/chrome/browser/net/net_error_tab_helper.cc
+++ b/chrome/browser/net/net_error_tab_helper.cc
@@ -24,13 +24,13 @@
 #include "url/gurl.h"
 
 using chrome_common_net::DnsProbeStatus;
-using chrome_common_net::DnsProbeStatusToString;
 using content::BrowserContext;
 using content::BrowserThread;
-using ui::PageTransition;
 using content::RenderViewHost;
 using content::WebContents;
 using content::WebContentsObserver;
+using error_page::DnsProbeStatusToString;
+using ui::PageTransition;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(chrome_browser_net::NetErrorTabHelper);
 
@@ -217,7 +217,7 @@ void NetErrorTabHelper::StartDnsProbe() {
 void NetErrorTabHelper::OnDnsProbeFinished(DnsProbeStatus result) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK_EQ(chrome_common_net::DNS_PROBE_STARTED, dns_probe_status_);
-  DCHECK(chrome_common_net::DnsProbeStatusIsFinished(result));
+  DCHECK(error_page::DnsProbeStatusIsFinished(result));
 
   DVLOG(1) << "Finished DNS probe with result "
            << DnsProbeStatusToString(result) << ".";