Added detection timeouts and usage of Retry-After HTTP header.

chrome/browser/captive_portal/captive_portal_detector.h

Index: chrome/browser/captive_portal/captive_portal_detector.h
diff --git a/chrome/browser/captive_portal/captive_portal_detector.h b/chrome/browser/captive_portal/captive_portal_detector.h
index 2e75645562a09c76e8f780c715299791f3cdfcac..f2c3fcfbb6783d2ff4f473c0bf17ab1813e023b6 100644
--- a/chrome/browser/captive_portal/captive_portal_detector.h
+++ b/chrome/browser/captive_portal/captive_portal_detector.h
@@ -59,6 +59,8 @@ class CaptivePortalDetector : public net::URLFetcherDelegate,
       const scoped_refptr<net::URLRequestContextGetter>& request_context);
   virtual ~CaptivePortalDetector();
 
+  static std::string CaptivePortalResultToString(Result result);
+
   // Triggers a check for a captive portal. After completion, runs the
   // |callback|.
   void DetectCaptivePortal(const GURL& url, const DetectionCallback& callback);